<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 main()
{
    int x;
    cin >> x;
    cout << 2-x*x;
    return 0;
}
