<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>

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define ls (p << 1)
#define rs (ls | 1)
#define tm ((tl + tr) >> 1)
#define lowbit(x) ((x) & -(x))

using namespace std;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;

constexpr double eps = 1e-8;
constexpr int NINF = 0xc0c0c0c0;
constexpr int INF = 0x3f3f3f3f;
constexpr ll LNINF = 0xc0c0c0c0c0c0c0c0;
constexpr ll LINF = 0x3f3f3f3f3f3f3f3f;
constexpr ll mod = 1e9 + 7;
constexpr ll N = 1e6 + 5;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int x;
    cin >> x;
    cout << 2 - x * x << '\n';
    
    return 0;
}