#include <iostream>
using namespace std;

int main()
{
    long long a,b;
    cin >> a >> b;
    long long mul = 1;
    for (int i = 1;i <= b;i++)
    {
        if (mul > (long long)(1e9))
        {
            cout << -1 << endl;
            break;
        }
        mul *= a;
    }
    cout << mul << endl;
    return 0;
}

测试点信息