#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
 
int a,b;
const ll M = 1e9;
 
ll qpow(ll a, ll b) {
    ll ans = 1;
    while (b) {
        if (b & 1) ans = ans * a;
        if (ans > M || a > M) return -1;
        a = a * a;
        b >>= 1;
    }
    return ans;
}
 
int main() {
    scanf("%d %d", &a, &b);
    printf("%lld\n", qpow(a, b));
    return 0;
}