// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
#define ll long long
using namespace std;
ll demuocbasic(ll n)
{
	ll Count=0;
	for(ll i=1;i<=trunc(sqrt(n));i++)
	{
		if(n%i==0)
		{
			if(i*i==n) Count+=i;
			else Count+=i+n/i;
		}
	}
	return Count;
}
int main() 
{
  ll n;
  cin>>n;
  if(n==0) cout<<0;
 else
  cout<<demuocbasic(n);
    return 0;
}