#include <bits/stdc++.h>
using namespace std;
int main() {
  long long n;
  cin >> n;
  long long ans = 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;
  cout << n - ans << endl;
}
