#include<iostream>
#include<cstdio>
#include<cstring>
#include<string>
#include<cctype>
#include<cstdlib>
#include<algorithm>
#include<bitset>
#include<vector>
#include<list>
#include<deque>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<cmath>
#include<sstream>
#include<fstream>
#include<iomanip>
#include<ctime>
#include<complex>
#include<functional>
#include<climits>
#include<cassert>
#include<iterator>
using namespace std;
int n;
long long int sum(long long int a, long long int b){
	long long int k = a + b - 1LL;
	return (a + k)*b / 2LL;
}
long long int __gcd(long long int a, long long int b){
	if (a > b){
		swap(a, b);
	}
	while (a){
		b %= a;
		swap(a, b);
	}
	return b;
}
int main(){
	scanf("%d", &n);
	long long int s = sum(1, n);
	long long int ss = sum(1 + 1LL, n);
	ss = __gcd(s, ss);
	long long int ind = 1LL;
	long long int ans = 0;
	set<long long int> S;
	while (ind*ind <= ss){
		if (ss%ind == 0LL){
			if (S.count(ind)){
				continue;
			}
			S.insert(ind);
			ans += ind;
		}
		ind++;
	}
	if (ind < ss){
		if (S.count(ss)){

		}
		else{
			ans += ss;
		}
	}
	printf("%lld\n", ans);
	return 0;
}