#include"bits/stdc++.h"

//#include<bits/stdc++.h>
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
typedef long long ll;
const ll mod = 10000000000;

int main() {
	ll n;
	cin >> n;
	ll ans = 1;
	if (n != 1 && n % 2 == 1)ans += n;
	else { n /= 2; ans += n; }
	for (ll i = 2; i*i <= n; i++) {
		if (n%i == 0) {
			ans += i;
			if (n / i != i)ans += n / i;
		}
	}
	
	print(ans);
	return 0;
}