#include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     int a = 2, b = 3, c = 5, d = 7;     int ab = 6, ac = 10, ad = 14, bc = 15, bd = 21, cd = 35;     int abc = 30, bcd = 105, abd = 42, acd = 70;     int abcd = 210;     cout << n - (n / a + n / b + n / c + n / d) +                 (n / ab + n / ac + n / ad + n / bc + n / bd + n / cd) -                 (n / abc + n / bcd + n / abd + n / acd) + n / abcd;   }   