#include <iostream>
#include <utility>

using namespace std;

long long gcd(long long a, long long b) {
	do {
		if (a < b) {
			swap(a, b);
		}
		a = a % b;
	} while (a != 0);
	return b;
}

int main() {
	long long n;
	cin >> n;
	if (n == 1) {
		cout << 1 << endl;
	} else {
		cout << gcd(n, n * (n - 1) / 2) << endl;
	}
	return 0;
}