#include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     long long ans = 0;     int t = n;     for (int i = 2; i * i <= t; ++i) {       while (n % i == 0) {         ans += n;         n /= i;       }     }     ans += n == 1 ? 1 : n + 1;     cout << ans;     return 0;   }   