<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>
#include <algorithm>
#define ll long long
#define pb push_back

using namespace std;

void solve1(){
   int t;
   cin >> t;
   cout << 2 - t*t;
}

int main(){
    ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
    solve1();
    return 0;
}