#include <iostream>
#include <algorithm>
#include <functional>
#include <string>
#include <climits>
#include <vector>
#include <numeric>
#include <complex>
#include <map>
#include <bitset>
#include <stack>
#include <queue>
using namespace std;

#define __int64 long long
#define long __int64
#define REP(i,a,b) for(int i=a;i<b;i++)
#define rep(i,n) REP(i,0,n)
const int Vecy[4] = {0,-1,0,1};
const int Vecx[4] = {1,0,-1,0};
const int modd = 1000000007;

long func(long a, long b){
	long check;
	while(true){
		check = a % b;
		if(check == 0){
			return b;
		}
		a = b;
		b = check;
	}
}

long func2(long a){
	if(a == 1){
		return 1;
	}
	long ans = a + 1;
	for(long i=2; i<= pow(a, 0.5) + 0.5; i++){
		if(a % i == 0){
			ans += i;
			ans += (a / i );
		}
	}
	
	return ans;
}

int main(){
	long n,b;
	long ans;
	cin >> n;
	
	b = n * (n - 1) / 2;
	cout << func2(func(b,n)) << endl;
	
    return 0;
}