1 #include <iostream>
 2 using namespace std;
 3 int main()
 4 {
 5     int a, b;
 6     while(cin >> a >> b)
 7     {
 8         if (a == 0 && b == 0)
 9             break;
10         int sum = 1;
11         for(int i = 0; i < b; i++)
12         {
13             sum = sum * a;
14             if(sum > 1000)
15                 sum %= 1000;
16         }
17         cout << sum << endl;
18     }
19     return 0;
20 }