hd2035

#include<cstdio>
#include<iostream>
using namespace std;
int r3(int i)
{
    return i%1000;
}
int f(int a,int b)
{
    int i,result=r3(a);
    int t=result;
    for(i=1;i<b;i++)
    {
        result=r3(result*t);
    }
    return r3(result);
}
int main()
{
    int A,B;
    while(scanf("%d %d",&A,&B))
    {
        if(A==0&&B==0)break;
        printf("%d\n",f(A,B));
    }
}