#include <stdio.h>

int main(){
	int num = 0;
	scanf("%d",&num);
	
	int normal = 0;
	int skil = num * 2;
	
	int xp = num;
	while(xp != 0){
		normal += num;
		xp *= 2;
	}
	
	if(normal <= skil){
		printf("%d",skil - normal);
	}else{
		printf("%d",normal - skil);
	}
}