#include <stdio.h>

int gcd(int u, int v);

int main(){

	int N;

	scanf("%d",&N);

	printf("%d\n", gcd((N*(N + 1)) / 2, N));

	return 0;
}
int gcd(int u, int v) {
	int r;
	while (0 != v) {
		r = u % v; u = v; v = r;
	}
	return u;
}