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