#include <bits/stdc++.h>
using namespace std;
const int K = 30;
const int MOD = 1e9 + 7;
long long n, power[K + 1];
int k;
__inline void add(int &a, int b) {
  if ((a += b) >= MOD) {
    a -= MOD;
  }
}
struct Matrix {
  int trans[K][K];
  int go[K];
  Matrix() {
    memset(trans, 0, sizeof(trans));
    memset(go, 0, sizeof(go));
  }
  int all() {
    int result = 0;
    for (int i = 0; i < k; i++) {
      add(result, go[i]);
      for (int j = 0; j < k; j++) {
        add(result, trans[i][j]);
      }
    }
    return result;
  }
};
map<long long, Matrix> mp;
Matrix search(long long n) {
  if (mp.count(n)) {
    return mp[n];
  }
  Matrix ret;
  if (k >= n) {
    for (int i = 0; i < n; i++) {
      ret.go[i] = 0;
      ret.trans[i][i] = 1;
      for (int j = i + 1; j < n; j++) {
        ret.trans[i][j] = power[j - i - 1];
      }
    }
    return ret;
  }
  long long unit = 1;
  int length = 1;
  while (unit <= n / k && unit * k < n) {
    unit *= k;
    length++;
  }
  Matrix base = search(unit);
  ret = base;
  long long remaind = n % unit;
  Matrix extra = search(remaind);
  static int reach[K][K], _reach[K][K];
  for (int i = 0; i < k; i++) {
    ret.go[i] = base.go[i];
    for (int j = 0; j < k; j++) {
      reach[i][j] = base.trans[i][j];
    }
  }
  for (int i = 1; i <= n / unit; i++) {
    if (i == n / unit && remaind == 0) {
      break;
    }
    Matrix &nxt = (i < n / unit) ? base : extra;
    int lead = i;
    for (int j = 0; j < k; j++) {
      for (int l = 0; l < k; l++) {
        _reach[j][l] = reach[j][l];
        add(ret.go[j], reach[j][l]);
        reach[j][l] = 0;
      }
    }
    int t = ((k - 1) * (length - 2) + i - 1) % k;
    for (int start = 0; start < k; start++) {
      int sum = 0;
      for (int prev = k - 1; prev >= 0; prev--) {
        int pv = (prev + t) % k;
        add(sum, _reach[start][pv]);
        int succ = prev;
        int sv = (succ + t) % k, temp = ((sv - i) % k + k) % k;
        add(ret.go[start], 1LL * sum * nxt.go[temp] % MOD);
        for (int end = 0; end < k; end++) {
          add(reach[start][end],
              1LL * sum * nxt.trans[temp][((end - i) % k + k) % k] % MOD);
        }
      }
    }
    for (int i = 0; i < k; i++) {
      for (int j = 0; j < k; j++) {
        ret.trans[i][j] = reach[i][j];
      }
    }
  }
  return mp[n] = ret;
}
int main() {
  power[0] = 1;
  for (int i = 1; i <= K; i++) {
    power[i] = power[i - 1] * 2;
  }
  cin >> n >> k;
  Matrix answer = search(n);
  cout << (answer.all() + 1) % MOD << endl;
  return 0;
}
