#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n, r;
  scanf(" %I64d", &n);
  r = n / 2 + n / 3 + n / 5 + n / 7 - n / 6 - n / 10 - n / 14 - n / 15 -
      n / 21 - n / 35 + n / 30 + n / 42 + n / 70 + n / 105 - n / 210;
  printf("%I64d\n", n - r);
  return 0;
}
