#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
inline long long read() {
  long long x = 0, f = 1;
  char ch = getchar();
  while (ch < '0' || ch > '9') {
    if (ch == '-') f = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') {
    x = (x << 1) + (x << 3) + ch - '0';
    ch = getchar();
  }
  return x * f;
}
int K, p[3010][32], rt;
struct mat {
  int a[32][32];
  friend mat operator*(mat x, mat y) {
    mat z;
    memset(z.a, 0, sizeof z.a);
    for (int i = 0; i <= K; ++i)
      for (int j = 0; j <= K; ++j)
        for (int k = 0; k <= K; ++k)
          z.a[i][j] = (z.a[i][j] + (long long)x.a[i][k] * y.a[k][j]) % mod;
    return z;
  }
} A[3010], T[35], W, I;
long long o[110];
mat query(int x, int d, long long k) {
  if (o[d] == k) return A[x];
  int i;
  mat h = I;
  for (i = 0; i < K; ++i) {
    if (k >= o[d - 1]) {
      k -= o[d - 1];
      h = h * A[p[x][i]];
    } else {
      if (k) h = h * query(p[x][i], d - 1, k);
      break;
    }
  }
  return h;
}
int main() {
  long long n = read();
  int i, j, N = 1, ans = 0, x;
  K = read();
  for (i = 0; i <= K; ++i) I.a[i][i] = 1;
  o[0] = 1, o[1] = K, A[K + 1] = I;
  for (i = 0; i < K; ++i) {
    for (j = 0; j <= K; ++j) A[i + 1].a[j][j] = 1;
    for (j = 0; j <= K; ++j) A[i + 1].a[i][j] = 1;
    p[K + 1][i] = i + 1;
    A[K + 1] = A[K + 1] * A[i + 1];
  }
  rt = K + 1;
  while (o[N] != -1 && o[N] < n) {
    if (o[N] <= n / K)
      o[++N] = o[N - 1] * K;
    else
      o[++N] = -1;
    T[K] = I;
    for (i = K - 1; ~i; --i) T[i] = A[p[rt][i]] * T[i + 1];
    W = I, x = rt;
    rt += K, A[rt] = A[x], p[rt][0] = x;
    for (i = 1; i < K; ++i) {
      for (j = i; j < K; ++j) p[x + i][j - i] = p[x][j];
      for (j = 0; j < i; ++j) p[x + i][j + K - i] = p[x][j];
      W = W * A[p[x][i - 1]];
      A[x + i] = T[i] * W;
      A[rt] = A[rt] * A[x + i];
      p[rt][i] = x + i;
    }
  }
  W = query(rt, N, n);
  for (i = 0; i <= K; ++i) ans = (ans + W.a[i][K]) % mod;
  printf("%d\n", ans);
  return 0;
}
