#include <iostream>
#include<cmath>
using namespace std;
void pr(int n)
{
long long sum = 0 ;
for (int i = 1 ; i*i <= n; i++)
{
if (n % i == 0)
{
sum+=i;
if (i*i != n)
{
sum+=n/i;
}
}
}
cout << sum ;
}
int main()
{
cin.tie(0);
cin.sync_with_stdio(0);
long long n;
cin>>n;
pr(n) ;
return 0;
}
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