2021-04-05

2035

#include <bits/stdc++.h>
using namespace std;
#define LL long long
int qp(LL a, LL b, int mod)
{
    int res = 1;
    while(b){
        if(b&1) res = res*a%mod;
        a = a*a%mod;
        b >>= 1;
    }
    return res;
}
int main()
{
    int a, b;
    while(scanf("%d %d", &a, &b) == 2){
        if(a == 0 && b == 0) break;
        printf("%d\n", qp(a, b, 1000));
    }
    return 0;
}