#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n) for(ll i=0;i<(n);++i)

main(){

  ll n;
  cin>>n;

  auto div = [](ll n){
    vector<ll> div;
    for(ll p=1;p*p<=n;++p){
      if(n%p==0){
        div.emplace_back(p);
        if(p*p!=n)div.emplace_back(n/p);
      }
    }
    sort(div.begin(),div.end());
    return div;
  };
  auto vsum = [](vector<ll> const& v){
    ll sum = 0;
    for(auto const& value:v){
      sum += value;
    }
    return sum;
  };

  auto d = div(n);
  ll s = vsum(d);

  cout<<(s)<<endl;

}