<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 h,w;
int x;
int main(){
	cin>>x;
	cout<<2-x*x<<endl;
}
/*
Happy April Fool's Day !!!11 
*/
