#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
void solveCP311() {
  ll n;
  cin >> n;
  ll val = 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 - val;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ll t = 1;
  while (t--) {
    solveCP311();
  }
  return 0;
}
