#include<iostream>
using namespace std;
unsigned long long gcd(unsigned long long a, unsigned long long b);

int main()
{
	unsigned long long n;
	cin >> n;
	cout << gcd(n*(n + 1) / 2, n) << endl;
	return 0;
}

unsigned long long gcd(unsigned long long a, unsigned long long b)
{
	int c;
	if (a < b) {
		c = a;
		a = b;
		b = c;
	}
	while (b != 0) {
		c = a%b;
		a = b;
		b = c;
	}
	return a;
}