import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Deque;
import java.util.HashMap;
import java.util.InputMismatchException;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Scanner;
import java.math.BigInteger;
    
public class Main{

static final InputStream in=System.in;
static final PrintWriter out=new PrintWriter(System.out);
    
public static void main(String[] args) throws IOException{
Scanner sc=new Scanner(in);
BigInteger n=sc.nextBigInteger();
BigInteger m=sc.nextBigInteger();
out.println(n.modPow(m,BigInteger.TEN));
out.flush();
}
}