<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<bits/stdc++.h>
using namespace std;
int a[100002],x,y,n,m,k,p,yoy;
int main()
{
    cin>>x;
    printf("%d\n",2-x*x);
    return 0;
}