#include <stdio.h>

int sankaku(int x){return (x*(x+1))/2;}
int gcd(int x,int y){int z;while(y){z=x%y;x=y;y=z;}return x;}

int main(void) {
	int n;
	scanf("%d",&n);
	if(n <= 2){printf("1\n");}
	else{printf("%d\n",gcd(n,sankaku(n)));}
	return 0;
}