func_code_string: #include <bits/stdc++.h>   using namespace std;   long long get(long long n) {     for (long long i = 2; i * i <= n; ++i)       if (n % i == 0) return i;     return n;   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n;     cin >> n;     int c = 0;     while (n % 2 != 0) {       n -= get(n);       c++;     }     cout << c + n / 2 << endl;   }   