#include <bits/stdc++.h>
using namespace std;

int main()
{
    long long n, m;
    cin >> n >> m;
    if (n > 1e9 || m > 1e9)
    {
        cout << -1 << endl;
        return 0;
    }
    int sum = 1;
    for (int i = 1; i <= m; i++)
    {
        sum *= n;
        if (sum > 1e9)
        {
            cout << -1 << endl;
            return 0;
        }
    }
    cout << sum << endl;
    return 0;
}