<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<iostream>
#include<math.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    int c = pow(n,2);
    int s = 2 - c;
    cout<<s<<endl;
    return 0;
}