#include <bits/stdc++.h>
using ll = long long;
using namespace std;

ll n, ok=0;
int main()
{
    cin.tie(0)->sync_with_stdio(0);
    cin >> n;
    for(int i=1; i*i<=n; ++i)
    {
        if(n%i==0)
        {
            ok += i + n/i;
        }
    }
    ll k = sqrt(n);
    if(k*k == n) {ok -= k;}
    cout << ok;
    return 0;
}