#include <bits/stdc++.h>
using namespace std;
#define int long long
#define MAX 1000000000
int a,b;
int fast_power(int x,int y) {
	int ans = 1;
	while(y > 0) {
        if(y & 1) {
        	ans = ans * x;
        	if(ans > MAX) return -1;
		}
        x = x * x;
        if(ans > MAX) return -1;
        y >>= 1;
    }
    if(ans > MAX) return -1;
    return ans;
}
signed main() {
	cin >> a >> b;
	cout << fast_power(a,b) << endl;
	return 0;
}

有3个点错了