<image> <image>

*The two images are equivalent, feel free to use either one.

Input

The input contains a single integer a (-100 ≤ a ≤ 100).

Output

Output the result – an integer number.

Example

Input


1


Output


1
#include <cstdio>
#include <cstring>

// int cnt[]={3, 1, 2, 2, 3, 2, 3, 4, 3, 2 };
int cnt[]={3, 1, 2, 2, 3, 2, 3, 4, 3, 2 };
int main(){
	int x;
	scanf("%d",&x);
	
	printf("%d\n", 2-x*x);


	return 0;
}