func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     long long by = (n / 2) + (n / 3) + (n / 5) + (n / 7) - (n / 6) - (n / 10) -                    (n / 14) - (n / 15) - (n / 35) - (n / 21);     by += (n / 30) + (n / 42) + (n / 70) + (n / 105);     by -= (n / 210);     cout << n - by << endl;     return 0;   }   