#include <bits/stdc++.h>
using namespace std;
const long long mod = 998244353;
const long long inf = 1e18;
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long n, b;
  cin >> n >> b;
  long long i = 2;
  long long ans = inf;
  while (i <= b) {
    if (i * i > b) i = b;
    long long cnt = 0;
    while (b % i == 0) {
      b /= i;
      cnt++;
    }
    if (cnt == 0) {
      i++;
      continue;
    }
    long long tmp = 0;
    long long j = 1;
    while (j <= n / i) {
      j *= i;
      tmp += n / j;
    }
    ans = min(ans, tmp / cnt);
    i++;
  }
  cout << ans;
  return 0;
}
