include <stdio.h>

int main() {

int a, b; long long sum = 1; scanf("%d%d", &a, &b); if (a == 1) {

printf("1");
return 0;

} if (b == 1) {

printf("%d", a);
return 0;

} while (b--) {

sum *= a;
if (sum > 1000000000) {

	printf("-1");
	return 0;
}

} printf("%lld", sum); return 0; }