#include<bits/stdc++.h>
#define int long long
using namespace std;
int qpow(int base,int p){
	int ans=1,tmp=base;
	while(p){
		if(p&1){
			if(1e9<ans*tmp)return -1;//乘完以后一定会爆1e9 
			ans*=tmp;
		}
		if(tmp>31622)return -1;//sqrt(1e9)
		tmp*=tmp;
		p>>=1;
	}
	return ans>1e9?-1:ans;
}

signed main(){
    int a,b;cin>>a>>b;
    if(a==1){
        cout<<1;
        return 0;
    }
    if(a>10&&b>=9){
		cout<<-1<<endl;return 0;
    }
    cout<<qpow(a,b)<<endl;
}

60pts，原因未知，求大佬解答