1 0 0 0.76202 2 0.77898 0 1.1372 3 1.2002 0 0.99839 4 1.7238 0 1.5461 5 2.5941 0 2.0531 6 3.3739 0 2.0692 7 4.0036 0 1.6247 8 4.4406 0 2.3398 9 5.079 0 1.6406 10 5.4716 0 1.8761 11 6.1544 0 1.7164 12 6.6417 0 1.4675 13 7.0018 0 1.3005 14 7.1919 0 2.3483 15 7.9391 0 2.0691 16 8.5587 0 0.87376 17 8.739 0 1.2426 18 8.9979 0 1.0905 19 9.2301 0 1.7702 20 9.8854 0 1.7375 21 10.991 0 2.1224 22 11.864 0 1.4438 23 12.195 0 1.6556 24 12.602 0 0.17943 25 12.629 0 0.24816 26 12.663 0 0.82193 27 13.614 0 0.76173 28 14.552 0 0.83968 29 15.462 0 0.96148 30 16.354 0 1.1363 31 17.211 0 1.4597 32 18.007 0 0.98041 33 18.244 0 1.3295 34 18.581 0 0.94636 35 18.796 0 0.10581 36 18.799 0 0.95317 37 19.042 0 0 38 18.958 0 0.85962 39 19.689 0 0.64866 40 20.459 0 0.71939 41 21.316 0 0.67814 42 22.109 0 0.93355 43 22.989 0 1.2312 44 24.437 0 1.8162 45 24.565 0 1.7144 46 24.576 0 1.2834 47 25.26 0 1.357 48 24.762 0 1.147 49 24.132 0 1.8505 50 23.398 0 2.1729 51 23.226 0 1.1376 52 23.397 0 0.60443 53 23.356 0 1.2993 54 24.015 0 1.4671 55 24.368 0 1.7692 56 24.943 0 1.4173 57 25.478 0 2.799 58 25.848 0 2.0376 59 25.971 0 3.3853 60 25.771 0 3.746 61 25.429 0 2.7434 62 24.644 0 3.5683 63 23.725 0 3.2193 64 22.253 0 2.8783 65 22.51 0 1.4617 66 22.981 0 1.7683 67 23.432 0 1.529 68 23.885 0 1.4843 69 24.012 0 2.64 70 24.396 0 2.4585 71 24.378 0 2.9084 72 24.687 0 3.6228 73 25.241 0 2.1123 74 25.697 0 2.0503 75 25.674 0 2.4553 76 25.763 0 2.0768 77 25.963 0 2.4829 78 26.274 0 2.2521 79 26.239 0 1.9737 80 26.777 0 1.4889 81 27.099 0 2.2643 82 27.475 0 1.9085 83 27.395 0 1.2284 84 26.939 0 2.1775 85 26.584 0 2.1644 86 26.213 0 2.7137 87 25.587 0 2.6588 88 25.385 0 2.627 89 25.101 0 2.3341 90 24.79 0 1.3218 91 24.217 0 2.0961 92 23.468 0 1.9867 93 22.777 0 2.3867 94 22.184 0 1.9997 95 22.801 0 1.7632 96 23.395 0 1.6806 97 23.477 0 2.5078 98 23.635 0 2.1697 99 23.719 0 0.35474 100 23.382 0 1.5838 101 23.831 0 2.3449 102 24.798 0 1.9473 103 25.741 0 2.2443 104 26.649 0 1.767 105 27.372 0 1.5146 106 27.988 0 0.72979 107 27.751 0 2.4895 108 27.521 0 2.845 109 27.693 0 3.7342 110 28.257 0 2.7925 111 28.343 0 3.6805 112 28.631 0 4.0489 113 29.512 0 3.9777 114 30.066 0 3.9731 115 29.712 0 3.4941 116 29.481 0 1.8495 117 28.578 0 1.5026 118 27.757 0 2.1257 119 27.535 0 3.1881 120 27.901 0 2.6342 121 27.901 0 2.5147 122 28.169 0 1.6114 123 27.768 0 2.8591 124 27.441 0 3.0843 125 26.805 0 3.9018 126 27.675 0 3.7109 127 28.478 0 3.2963 128 28.879 0 3.5089 129 29.691 0 2.7621 130 29.85 0 2.3146 131 29.587 0 2.9243 132 29.629 0 2.9607 133 29.377 0 2.1601 134 28.703 0 1.933 135 28.887 0 2.0515 136 28.995 0 1.7266 137 28.952 0 1.0861 138 28.831 0 1.8641 139 28.729 0 2.8536 140 29.205 0 2.2656 141 29.229 0 2.1284 142 29.215 0 2.4227 143 29.219 0 2.2384 144 29.076 0 2.1669 145 28.772 0 1.9286 146 29.036 0 2.2212 147 29.517 0 0.84925 148 28.839 0 2.4963 149 28.025 0 1.996 150 27.113 0 2.2269 151 26.237 0 1.8176 152 25.263 0 1.7757 153 24.557 0 1.3663 154 24.597 0 1.6429 155 24.484 0 1.4577 156 23.538 0 2.1662 157 22.923 0 2.1875 158 22.265 0 1.9592 159 21.39 0 2.3931 160 21.713 0 2.4193 161 22.123 0 1.8795 162 22.503 0 1.7613 163 22.691 0 2.0461 164 22.579 0 2.5809 165 22.794 0 2.188 166 22.995 0 1.1004 167 22.709 0 2.1027 168 22.101 0 3.4224 169 21.785 0 3.4698 170 21.653 0 2.5877 171 21.19 0 2.5055 172 19.949 0 2.3785 173 18.968 0 2.6141 174 17.605 0 2.754 175 16.343 0 2.0838 176 14.777 0 2.0644 177 13.528 0 2.5355 178 12.354 0 2.7901 179 11.58 0 1.8619 180 11.393 0 2.5377 181 11.059 0 1.8614 182 11.1 0 2.1274 183 11.129 0 2.2712 184 11.194 0 1.7081 185 10.869 0 2.2783 186 10.292 0 2.1026 187 9.8026 0 2.1164 188 10.151 0 1.5941 189 10.036 0 2.0507 190 9.3521 0 2.5391 191 8.9774 0 1.7797 192 8.7543 0 1.2896 193 8.6241 0 0.81981 194 8.0529 0 2.1945 195 7.4845 0 2.309 196 6.9504 0 2.7572 197 6.696 0 2.3279 198 6.5432 0 1.6167 199 6.2293 0 1.5158 200 5.7258 0 2.0946 201 5.4258 0 2.4876 202 5.4259 0 2.0396 203 5.2752 0 2.1669 204 5.397 0 1.7738 205 5.5423 0 2.113 206 5.8593 0 2.7762 207 6.8603 0 2.3232 208 7.8646 0 1.7676 209 8.1696 0 0.32638 210 8.1696 0 0 211 8.1696 0 0 212 8.1696 0 0 213 8.1696 0 0 214 8.1696 0 0 215 7.3608 0 1.4012 216 6.4365 0 1.7143 217 5.7003 0 2.1892 218 6.1349 0 1.0391 219 6.1883 0 1.3871 220 6.0023 0 1.9032 221 6.4421 0 1.8313 222 7.0126 0 1.7291 223 7.5398 0 2.1038 224 7.9026 0 2.8791 225 7.8218 0 3.2332 226 8.4144 0 2.2866 227 8.8389 0 1.634 228 9.2843 0 1.5073 229 9.6683 0 1.5116 230 9.9584 0 1.8533 231 10.231 0 0.82626 232 9.8324 0 2.0731 233 10.406 0 1.4917 234 11.425 0 2.2457 235 11.743 0 2.5248 236 11.91 0 1.5481 237 12.471 0 1.9837 238 12.791 0 2.0935 239 13.396 0 1.0284 240 13.407 0 1.431 241 14.131 0 1.8343 242 14.931 0 1.6711 243 15.541 0 0.98795 244 15.977 0 0.6669 245 16.151 0 1.1134 246 16.425 0 0.53768 247 16.167 0 1.8095 248 16.043 0 2.2199 249 16.603 0 2.2842 250 17.199 0 2.7596 251 17.371 0 3.3836 252 17.5 0 3.0126 253 17.462 0 2.3948 254 17.642 0 0.9229 255 17.706 0 2.1115 256 18.113 0 1.8924 257 18.106 0 2.1917 258 17.709 0 3.2116 259 17.613 0 3.3565 260 18.228 0 2.5902 261 18.771 0 2.2473 262 18.977 0 2.1393 263 19.124 0 1.457 264 18.989 0 2.2531 265 19.152 0 2.039 266 19.487 0 1.5606 267 19.662 0 1.6927 268 19.713 0 0.97154 269 19.737 0 0 270 19.737 0 0.34802 271 19.791 0 0.4864 272 19.736 0 1.0098 273 19.589 0 1.7932 274 19.717 0 0.78439 275 19.791 0 1.5451 276 20.112 0 1.1618 277 20.11 0 1.6128 278 20.061 0 1.0325 279 19.752 0 1.0431 280 19.718 0 1.1794 281 20.329 0 1.1317 282 21.014 0 1.1081 283 21.672 0 1.1723 284 21.709 0 2.7248 285 21.818 0 2.5298 286 21.632 0 2.5963 287 21.738 0 1.687 288 21.918 0 0.53438 289 21.527 0 1.7792 290 21.855 0 1.9718 291 22.103 0 2.5023 292 23.317 0 2.8234 293 23.808 0 2.9457 294 24.545 0 2.7251 295 25.116 0 1.5052 296 24.789 0 2.5717 297 23.891 0 3.1154 298 23.218 0 2.2809 299 22.321 0 2.2976 300 20.791 0 2.7938 301 21.166 0 2.4551 302 21.362 0 2.2045 303 21 0 2.3156 304 20.199 0 1.7375 305 18.787 0 2.0741 306 18.388 0 1.811 307 18.125 0 1.4788 308 18.275 0 0.49441 309 17.718 0 2.1614 310 16.559 0 5.0246 311 16.614 0 4.6359 312 16.58 0 3.9921 313 16.74 0 2.9663 314 17.22 0 2.9037 315 18.145 0 2.5212 316 18.65 0 4.0476 317 19.726 0 2.1454 318 20.28 0 2.4155 319 20.371 0 2.2771 320 20.293 0 2.515 321 20.835 0 2.6106 322 21.469 0 2.3898 323 21.767 0 1.7603 324 22.974 0 2.4302 325 23.903 0 2.8091 326 24.573 0 3.2048 327 26.333 0 2.4938 328 27.396 0 2.4994 329 27.901 0 1.9977 330 27.614 0 2.1145 331 27.94 0 1.3758 332 28.003 0 1.6742 333 27.465 0 1.3621 334 26.905 0 0.95264 335 27.171 0 1.3122 336 27.439 0 1.9155 337 28.648 0 2.5167 338 29.765 0 1.6446 339 30.151 0 2.2771 340 30.408 0 1.8205 341 30.433 0 1.8437 342 30.222 0 2.0205 343 30.173 0 1.7632 344 30.122 0 1.1571 345 29.982 0 1.5715 346 29.827 0 2.6115 347 29.825 0 2.3681 348 29.834 0 2.7664 349 29.951 0 2.3166 350 29.875 0 2.1424 351 29.907 0 1.0622 352 29.887 0 0.40703 353 29.378 0 1.5019 354 28.679 0 2.2688 355 27.985 0 2.3882 356 27.272 0 3.3769 357 27.381 0 2.5951 358 27.396 0 3.1169 359 27.232 0 2.2834 360 26.162 0 2.0689 361 26.282 0 2.1606 362 26.573 0 2.0378 363 27.264 0 1.9815 364 27.343 0 0.75597 365 26.878 0 2.9672 366 26.328 0 4.4491 367 25.96 0 3.0956 368 25.315 0 1.2369 369 24.455 0 1.8182 370 24.581 0 2.3906 371 24.021 0 3.6116 372 23.754 0 2.3644 373 23.262 0 1.7918 374 23.012 0 2.0645 375 22.937 0 3.5069 376 23.604 0 2.5317 377 23.864 0 2.3114 378 23.499 0 2.6746 379 23.828 0 2.9251 380 23.999 0 3.3289 381 23.947 0 3.7004 382 23.95 0 3.9528 383 23.886 0 2.3221 384 22.853 0 3.1087 385 22.281 0 3.037 386 21.797 0 4.631 387 22.45 0 2.6781 388 22.392 0 2.1534 389 21.772 0 4.2187 390 20.969 0 2.9548 391 21.318 0 2.4116 392 20.973 0 3.7393 393 20.743 0 2.8057 394 19.913 0 2.5256 395 19.892 0 3.0137 396 19.919 0 3.423 397 20.444 0 1.313 398 20.273 0 2.0714 399 20.043 0 2.5859 400 20.002 0 2.5632 401 19.794 0 3.8098 402 19.506 0 3.7643 403 19.036 0 3.7134 404 18.772 0 3.0039 405 18.033 0 1.3949 406 18.276 0 0.95658 407 18.255 0 1.4236 408 17.915 0 2.2304 409 17.739 0 1.9018 410 17.533 0 2.8991 411 17.782 0 2.5732 412 17.937 0 2.1121 413 17.993 0 3.7883 414 18.116 0 3.9785 415 17.828 0 4.6373 416 18.063 0 2.2908 417 17.701 0 2.485 418 17.624 0 2.4228 419 17.835 0 0.77503 420 17.723 0 1.5046 421 17.812 0 1.4518 422 18.295 0 2.9471 423 18.736 0 2.869 424 19.148 0 2.0351 425 19.414 0 1.6186 426 19.054 0 1.5786 427 18.698 0 1.3678 428 18.959 0 2.2547 429 19.089 0 2.4545 430 19.204 0 2.5534 431 18.614 0 3.5442 432 18.844 0 2.159 433 18.48 0 1.7033 434 18.462 0 0.36716 435 18.402 0 0.37975 436 17.665 0 2.2356 437 16.905 0 2.0146 438 16.093 0 2.0619 439 15.539 0 2.0533 440 15.452 0 1.878 441 14.61 0 3.7425 442 14.042 0 3.5978 443 14.34 0 1.4793 444 14.283 0 0.95726 445 14.176 0 0.70122 446 14.067 0 0.65347 447 13.979 0 0.50653 448 13.941 0 0.26796 449 13.929 0 0.090804 450 13.749 0 1.585 451 13.937 0 2.3924 452 13.617 0 3.615 453 13.285 0 3.2933 454 13.158 0 2.5921 455 13.157 0 2.369 456 13.369 0 2.0813 457 13.617 0 2.1714 458 14.05 0 1.3925 459 14.406 0 0.13338 460 14.389 0 0.34553 461 14.383 0 1.6237 462 14.413 0 1.4308 463 14.501 0 1.0112 464 14.809 0 1.9242 465 15.253 0 2.0033 466 15.642 0 1.8865 467 15.95 0 0.94935 468 15.204 0 1.0495 469 14.442 0 1.0133 470 13.678 0 1.8688 471 14.394 0 1.6937 472 14.98 0 1.9955 473 15.261 0 3.311 474 15.815 0 2.5793 475 16.031 0 2.791 476 16.37 0 2.1302 477 16.324 0 2.35 478 16.924 0 1.6901 479 17.403 0 1.1143 480 17.478 0 2.0254 481 18.293 0 2.2832 482 18.805 0 2.682 483 19.139 0 3.4514 484 19.968 0 2.6636 485 20.583 0 1.9415 486 21.071 0 1.5641 487 21.487 0 0.36503 488 21.315 0 0.81719 489 21.066 0 2.7964 490 21.2 0 2.587 491 21.184 0 1.2949 492 21.482 0 2.8836 493 22.234 0 2.5701 494 22.735 0 1.5107 495 23.074 0 1.6044 496 23.718 0 1.5815 497 24.219 0 1.6069 498 24.772 0 2.5678 499 25.069 0 3.1713 500 25.646 0 2.9247 501 24.772 0 4.2515 502 24.977 0 3.203 503 24.5 0 4.0175 504 24.182 0 2.7628 505 23.473 0 2.6936 506 22.665 0 2.0037 507 21.534 0 2.9026 508 21.49 0 1.8447 509 21.931 0 2.0228 510 22.42 0 1.9051 511 22.126 0 1.7648 512 21.591 0 1.9284 513 22.156 0 1.0078 514 22.505 0 2.6887 515 23.805 0 2.5119 516 24.308 0 3.2307 517 24.924 0 1.9932 518 25.264 0 1.5359 519 25.569 0 1.9426 520 25.965 0 1.6912 521 26.217 0 0.39701 522 26.267 0 0 523 25.855 0 1.1515 524 25.456 0 1.3442 525 25.08 0 1.4563 526 25.029 0 1.9165 527 25.581 0 1.6878 528 25.686 0 1.6379 529 25.901 0 1.6931 530 26.318 0 0.45041 531 26.244 0 0.53498 532 25.783 0 2.2107 533 26.054 0 2.2464 534 26.386 0 1.965 535 26.743 0 1.7336 536 27.351 0 0.8474 537 27.433 0 0.45669 538 27.391 0 0.24855 539 27.353 0 0.50472 540 26.937 0 1.2454 541 26.161 0 1.6105 542 25.342 0 1.5875 543 24.887 0 1.5134 544 24.356 0 1.656 545 23.558 0 1.8142 546 22.347 0 3.5385 547 21.588 0 3.7671 548 21.281 0 2.9839 549 21.492 0 2.3524 550 20.839 0 2.4957 551 19.889 0 1.7316 552 18.551 0 1.8497 553 17.296 0 1.7184 554 16.906 0 2.1899 555 16.481 0 2.2728 556 15.706 0 2.1657 557 14.769 0 1.7474 558 13.443 0 2.5556 559 12.774 0 2.5505 560 11.872 0 2.4735 561 10.733 0 2.4107 562 10.674 0 0.70692 563 10.192 0 1.9927 564 9.8101 0 2.1224 565 9.3881 0 1.6469 566 8.667 0 1.7539 567 7.995 0 1.9126 568 7.2841 0 0.96648 569 7.0863 0 1.1599 570 6.93 0 0.85206 571 6.7227 0 0.86227 572 6.5044 0 0.92763 573 6.2962 0 1.0893 574 6.3449 0 0.56177 575 6.4326 0 0.40684 576 6.0433 0 1.3112 577 5.5035 0 1.214 578 4.7409 0 1.1722 579 3.7296 0 0.69639 580 3.5763 0 0.67484 581 5.208 0 0.81469 582 6.266 0 1.2659 583 6.4296 0 1.2156 584 6.602 0 0.33846 585 6.6648 0 0.14491 586 6.5725 0 1.9121 587 6.9736 0 1.275 588 5.8229 0 1.8245 589 5.8941 0 1.1289 590 5.9133 0 1.7437 591 6.9321 0 1.8642 592 7.992 0 2.5175 593 9.2039 0 2.3675 594 10.076 0 2.6321 595 10.656 0 1.6181 596 11.198 0 1.242 597 12.28 0 1.7379 598 13.41 0 1.6948 599 14.364 0 0.31649 600 14.365 0 1.8638 601 15.212 0 1.6573 602 15.812 0 1.6949 603 16.05 0 2.0299 604 16.386 0 1.2591 605 16.489 0 2.0325 606 16.585 0 1.8409 607 16.42 0 1.129 608 15.887 0 1.348 609 15.749 0 1.3364 610 15.835 0 3.6584 611 15.698 0 4.4726 612 15.635 0 3.786 613 15.776 0 1.7826 614 15.426 0 1.3887 615 15.425 0 0.49752 616 15.392 0 0.46707 617 15.342 0 0.7219 618 16.173 0 0.59824 619 17.054 0 0.64047 620 17.856 0 0.75456 621 18.593 0 0.85764 622 19.28 0 1.1416 623 20.044 0 0.43106 624 20.132 0 0.63006 625 20.256 0 0.83389 626 20.428 0 0.44288 627 20.52 0 0 628 20.52 0 0 629 20.444 0 0.50493 630 20.361 0 0.71084 631 20.218 0 1.1107 632 20.168 0 0.68608 633 20.184 0 0.1673 634 19.421 0 0.78883 635 18.583 0 0.74391 636 18.111 0 0.70651 637 17.611 0 1.181 638 17.369 0 0.44152 639 16.582 0 1.0062 640 17.045 0 1.0582 641 17.257 0 1.6621 642 17.549 0 2.8296 643 18.422 0 2.9308 644 19.568 0 0.22542 645 19.161 0 1.3624 646 19.323 0 2.7347 647 19.587 0 2.3614 648 18.583 0 4.4035 649 18.205 0 4.9285 650 18.209 0 4.1081 651 17.918 0 3.4735 652 17.383 0 2.533 653 17.218 0 1.4056 654 16.661 0 2.2122 655 16.308 0 2.0576 656 15.561 0 2.0803 657 15.616 0 3.2569 658 15.988 0 4.3864 659 15.941 0 4.9039 660 16.591 0 2.2257 661 16.649 0 2.4744 662 17.756 0 1.7368 663 18.798 0 2.0157 664 19.718 0 2.4794 665 20.437 0 2.9407 666 21.123 0 2.7708 667 21.804 0 1.5495 668 21.607 0 1.169 669 21.57 0 0.49153 670 21.592 0 0.40503 671 21.61 0 0.09191 672 21.513 0 0.87647 673 21.376 0 1.3582 674 21.207 0 1.5391 675 21.174 0 0.5661 676 21.082 0 0.7188 677 20.975 0 1.0288 678 20.933 0 0.42419 679 20.933 0 0.10292 680 20.601 0 2.4413 681 20.542 0 1.8928 682 20.448 0 1.1371 683 20.169 0 1.3061 684 19.405 0 2.1858 685 18.915 0 1.799 686 18.573 0 1.1976 687 17.979 0 1.2411 688 17.274 0 2.0203 689 16.832 0 2.0127 690 16.935 0 0.98195 691 16.865 0 0.68351 692 16.221 0 1.848 693 15.773 0 1.6851 694 15.456 0 1.5149 695 14.847 0 2.964 696 15.639 0 2.577 697 16.385 0 2.0317 698 16.857 0 2.0298 699 16.57 0 3.739 700 16.377 0 2.8238 701 16.524 0 1.341 702 15.804 0 2.2317 703 14.961 0 1.931 704 14.126 0 2.1334 705 14.068 0 1.1681 706 12.972 0 2.6737 707 12.286 0 4.4729 708 11.818 0 5.3308 709 10.801 0 5.0003 710 10.936 0 2.3575 711 10.721 0 2.1683 712 11.058 0 1.5378 713 10.753 0 2.1627 714 10.207 0 1.4846 715 10.33 0 0.95205 716 11.38 0 0.89935 717 12.42 0 1.3686 718 13.37 0 2.0106 719 14.391 0 1.0623 720 14.507 0 1.0943 721 14.603 0 0.43379 722 14.601 0 0.33786 723 14.623 0 0.34648 724 14.645 0 0.11716 725 14.632 0 0.10422 726 14.632 0 0 727 14.616 0 0.11866 728 13.991 0 1.2669 729 13.423 0 1.3849 730 12.757 0 1.5064 731 12.097 0 1.4924 732 12.022 0 1.246 733 12.179 0 0.52894 734 12.299 0 0 735 12.299 0 0 736 11.996 0 1.2921 737 12.429 0 1.4448 738 12.993 0 1.0231 739 13.538 0 0.97296 740 14.289 0 0.87998 741 14.99 0 0 742 14.99 0 0.54624 743 15.116 0 0.099772 744 15.128 0 0.10034 745 15.142 0 0 746 15.129 0 0.098353 747 15.114 0 0.30052 748 15.117 0 0.34728 749 15.124 0 0.10595 750 15.109 0 0.11196 751 14.97 0 0.64403 752 14.957 0 0.099772 753 14.221 0 1.0717 754 13.265 0 1.5653 755 12.176 0 1.7146 756 11.029 0 1.6945 757 9.9435 0 1.1792 758 9.6654 0 1.0376 759 9.3243 0 1.8142 760 8.3842 0 4.203 761 7.5027 0 4.4565 762 6.7888 0 1.4846 763 6.6252 0 1.4034 764 6.4534 0 1.2508 765 5.8127 0 2.799 766 5.658 0 0.92063 767 5.658 0 0 768 5.1883 0 1.1345 769 4.4229 0 1.559 770 3.5153 0 1.1472 771 2.2776 0 1.8251 772 2.0883 0 1.5622 773 1.8952 0 1.6012 774 1.9491 0 0.46142 775 1.9054 0 0.60695 776 1.8905 0 0.55948 777 1.8629 0 0.44982 778 1.6092 0 0.9593 779 1.3196 0 1.1038 780 0.83648 0 1.7659 781 0.30308 0 1.5409 782 0.18275 0 0.62208 783 0.17198 0 0.085885 784 0.13511 0 0.28614 785 0.067553 0 0.4555 786 0.024206 0 0.25743 787 0.024206 0 0 788 -1.9061e-14 0 0.18857