#include <bits/stdc++.h>
using namespace std;
int main() {
  string n;
  cin >> n;
  int k;
  cin >> k;
  unsigned long long sum = 0;
  int digits = n.size();
  int ans1[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  int ans2[100] = {0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  2,  3,  4,
                   5,  6,  7,  8,  9,  9,  10, 11, 12, 13, 14, 15, 16, 17, 18,
                   18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31,
                   32, 33, 34, 35, 36, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45,
                   45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 54, 55, 56, 57, 58,
                   59, 60, 61, 62, 63, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72,
                   72, 73, 74, 75, 76, 77, 78, 79, 80, 81};
  int ans3[1000] = {
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
      0,   0,   0,   0,   0,   0,   1,   2,   3,   4,   5,   6,   7,   8,   9,
      9,   10,  11,  12,  13,  14,  15,  16,  17,  18,  18,  19,  20,  21,  22,
      23,  24,  25,  26,  27,  27,  28,  29,  30,  31,  32,  33,  34,  35,  36,
      36,  37,  38,  39,  40,  41,  42,  43,  44,  45,  45,  46,  47,  48,  49,
      50,  51,  52,  53,  54,  54,  55,  56,  57,  58,  59,  60,  61,  62,  63,
      63,  64,  65,  66,  67,  68,  69,  70,  71,  72,  72,  73,  74,  75,  76,
      77,  78,  79,  80,  81,  81,  81,  81,  81,  81,  81,  81,  81,  81,  81,
      81,  82,  83,  84,  85,  86,  87,  88,  89,  90,  90,  91,  92,  93,  94,
      95,  96,  97,  98,  99,  99,  100, 101, 102, 103, 104, 105, 106, 107, 108,
      108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 117, 118, 119, 120, 121,
      122, 123, 124, 125, 126, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
      135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148,
      149, 150, 151, 152, 153, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162,
      162, 162, 162, 162, 162, 162, 162, 162, 162, 162, 162, 163, 164, 165, 166,
      167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180,
      180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 189, 190, 191, 192, 193,
      194, 195, 196, 197, 198, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
      207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 216, 217, 218, 219, 220,
      221, 222, 223, 224, 225, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234,
      234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 243, 243, 243, 243, 243,
      243, 243, 243, 243, 243, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252,
      252, 253, 254, 255, 256, 257, 258, 259, 260, 261, 261, 262, 263, 264, 265,
      266, 267, 268, 269, 270, 270, 271, 272, 273, 274, 275, 276, 277, 278, 279,
      279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 288, 289, 290, 291, 292,
      293, 294, 295, 296, 297, 297, 298, 299, 300, 301, 302, 303, 304, 305, 306,
      306, 307, 308, 309, 310, 311, 312, 313, 314, 315, 315, 316, 317, 318, 319,
      320, 321, 322, 323, 324, 324, 324, 324, 324, 324, 324, 324, 324, 324, 324,
      324, 325, 326, 327, 328, 329, 330, 331, 332, 333, 333, 334, 335, 336, 337,
      338, 339, 340, 341, 342, 342, 343, 344, 345, 346, 347, 348, 349, 350, 351,
      351, 352, 353, 354, 355, 356, 357, 358, 359, 360, 360, 361, 362, 363, 364,
      365, 366, 367, 368, 369, 369, 370, 371, 372, 373, 374, 375, 376, 377, 378,
      378, 379, 380, 381, 382, 383, 384, 385, 386, 387, 387, 388, 389, 390, 391,
      392, 393, 394, 395, 396, 396, 397, 398, 399, 400, 401, 402, 403, 404, 405,
      405, 405, 405, 405, 405, 405, 405, 405, 405, 405, 405, 406, 407, 408, 409,
      410, 411, 412, 413, 414, 414, 415, 416, 417, 418, 419, 420, 421, 422, 423,
      423, 424, 425, 426, 427, 428, 429, 430, 431, 432, 432, 433, 434, 435, 436,
      437, 438, 439, 440, 441, 441, 442, 443, 444, 445, 446, 447, 448, 449, 450,
      450, 451, 452, 453, 454, 455, 456, 457, 458, 459, 459, 460, 461, 462, 463,
      464, 465, 466, 467, 468, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477,
      477, 478, 479, 480, 481, 482, 483, 484, 485, 486, 486, 486, 486, 486, 486,
      486, 486, 486, 486, 486, 486, 487, 488, 489, 490, 491, 492, 493, 494, 495,
      495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 504, 505, 506, 507, 508,
      509, 510, 511, 512, 513, 513, 514, 515, 516, 517, 518, 519, 520, 521, 522,
      522, 523, 524, 525, 526, 527, 528, 529, 530, 531, 531, 532, 533, 534, 535,
      536, 537, 538, 539, 540, 540, 541, 542, 543, 544, 545, 546, 547, 548, 549,
      549, 550, 551, 552, 553, 554, 555, 556, 557, 558, 558, 559, 560, 561, 562,
      563, 564, 565, 566, 567, 567, 567, 567, 567, 567, 567, 567, 567, 567, 567,
      567, 568, 569, 570, 571, 572, 573, 574, 575, 576, 576, 577, 578, 579, 580,
      581, 582, 583, 584, 585, 585, 586, 587, 588, 589, 590, 591, 592, 593, 594,
      594, 595, 596, 597, 598, 599, 600, 601, 602, 603, 603, 604, 605, 606, 607,
      608, 609, 610, 611, 612, 612, 613, 614, 615, 616, 617, 618, 619, 620, 621,
      621, 622, 623, 624, 625, 626, 627, 628, 629, 630, 630, 631, 632, 633, 634,
      635, 636, 637, 638, 639, 639, 640, 641, 642, 643, 644, 645, 646, 647, 648,
      648, 648, 648, 648, 648, 648, 648, 648, 648, 648, 648, 649, 650, 651, 652,
      653, 654, 655, 656, 657, 657, 658, 659, 660, 661, 662, 663, 664, 665, 666,
      666, 667, 668, 669, 670, 671, 672, 673, 674, 675, 675, 676, 677, 678, 679,
      680, 681, 682, 683, 684, 684, 685, 686, 687, 688, 689, 690, 691, 692, 693,
      693, 694, 695, 696, 697, 698, 699, 700, 701, 702, 702, 703, 704, 705, 706,
      707, 708, 709, 710, 711, 711, 712, 713, 714, 715, 716, 717, 718, 719, 720,
      720, 721, 722, 723, 724, 725, 726, 727, 728, 729};
  if (k == 1) {
    for (int i = 0; i < digits; i++) {
      int num = n[i] - '0';
      if (i == 0) {
        sum += ans1[num];
      } else {
        sum += ans1[9];
      }
    }
  } else if (k == 2) {
    for (int i = 0; i < digits - 1; i++) {
      int iNum = n[i] - '0';
      iNum *= 10;
      for (int j = i + 1; j < digits; j++) {
        int jNum = n[j] - '0';
        if (i == 0 && j == 1) {
          sum += ans2[iNum + jNum];
        } else if (i == 0) {
          sum += ans2[iNum + 9];
        } else {
          sum += ans2[99];
        }
      }
    }
  } else if (k == 3) {
    for (int i = 0; i < digits - 2; i++) {
      int iNum = n[i] - '0';
      iNum *= 100;
      for (int j = i + 1; j < digits - 1; j++) {
        int jNum = n[j] - '0';
        jNum *= 10;
        for (int k = j + 1; k < digits; k++) {
          int kNum = n[k] - '0';
          if (i == 0 && j == 1 && k == 2) {
            sum += ans3[iNum + jNum + kNum];
          } else if (i == 0 && j == 1) {
            sum += ans3[iNum + jNum + 9];
          } else if (i == 0) {
            sum += ans3[iNum + 99];
          } else {
            sum += ans3[999];
          }
        }
      }
    }
  }
  cout << sum << endl;
}
