#include <iostream>
#include<cstdlib>
#include<vector>
#include<algorithm>
using namespace std;

int main()
{
	long long n; cin >> n;
	if (!(n % 2))n /= 2;

	long long ans = 1;
	vector <long long> x;
	for (long long i = 2; i*i <= n; i++){
		if (!(n%i)){
			long long sum = 1;
			long long a = 1;
			while (!(n%i)){
				n /= i;
				a *= i;
				sum += a;
			}
			ans *= sum;
		}
	}
	if(n!=1)ans *= (n + 1);

	cout << ans << endl;

	return 0;
}