#include <bits/stdc++.h>
#define ll long long
using namespace std;
int tong(ll x)
{
    ll t = 1;
    for(ll i = 2; i * i <= x; i++)
    {
        if(x % i == 0)
        {
            t += i;
            if(x / i != i) t += x/i;
        }
    }
    return t + x;
}
int main()
{
    ll n;
    cin >> n;
    cout << tong(n);
    return 0;
}