Bai 4

#include <bits/stdc++.h>

using namespace std;

int main()
{
    int n, x;
    long long s = 0, power = 1;
    cin >> x >> n;
    for(int i = 1; i <= n; i++){
            power = power * x * x;
        if (i % 2 == 0) s+= power;
        else s-= power;
    }
    cout << s << '\n';

}