// https://infoarena.ro/problema/pascal
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'

ifstream fin("pascal.in");
ofstream fout("pascal.out");

const int MAXR=5000005;
short cnt[MAXR][3], s[MAXR][3];

int main() {
  int r, d;
  fin>>r>>d;

  for (int i=1; i<=r; ++i) {
    if (i%2==0) cnt[i][0] = cnt[i/2][0]+1;
    if (i%3==0) cnt[i][1] = cnt[i/3][1]+1;
    if (i%5==0) cnt[i][2] = cnt[i/5][2]+1;
  }

  for (int i=1; i<=r; ++i) {
    s[i][0] = s[i-1][0]+cnt[i][0];
    s[i][1] = s[i-1][1]+cnt[i][1];
    s[i][2] = s[i-1][2]+cnt[i][2];
  }
  
  int ans=0;
  for (int i=0; i<=r; ++i) {
    array<int,3> p{};
    for (int j=0; j<3; ++j) {
      p[j] = s[r][j] - s[r-i][j] - s[i][j];
    }

    bool ok=true;
    for (int j=0; j<3; ++j) {
      if (p[j]>=0) ok &= (p[j] >= cnt[d][j]);
    }
    ans += ok;
  }

  fout<<ans;
}