#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef __int128 i128;
const LL P = 1e9;
LL qpow(i128 a, i128 b)
{
    i128 ret = 1ll;
    for (; b; b >>= 1, a = a * a)
    {
        if (b & 1) ret = ret * a;
        if (ret > P) return -1;
    }
    return LL(ret);
}
int main()
{
    LL a, b; scanf("%lld%lld", &a, &b);
    printf("%lld\n", qpow(a, b)); 
    return 0;
}

#include<bits/stdc++.h>
using namespace std;
typedef long long LL;
typedef __int128 i128;
const LL P=1e9;
LL qpow(i128 a,i128 b)
{
    i128 ret=1ll;
    for(;b;b>>=1,a=a*a)
    {
        if(b&1)ret=ret*a;
        if(ret>P) return -1;
    }
    return LL(ret);
}
int main()
{
    LL a,b;scanf("%lld%lld",&a,&b);
    printf("%lld\n",qpow(a,b)); 
    return 0;
}