import java.util.*;
import java.lang.*;
import java.math.*;

public class Main {
    
    void run() {
        Scanner sc = new Scanner(System.in);
        BigInteger N = sc.nextBigInteger();
        BigInteger M = sc.nextBigInteger();
        System.out.println(N.modPow(M, BigInteger.TEN));
    }


    public static void main(String[] args) {
        new Main().run();
    }

}