#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  ll N; cin >> N;
  map<ll, int> mp;
  for(int i = 1; i*i <= N; i++){
    if(N%i == 0){
      mp[N/i]++;
      mp[i]++;
    }
  }
  ll ans = 0;
  for(auto p: mp){
    ans += p.first;
  }
  cout << ans << endl;
}