using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
 
class Program
{
    public void Proc()
    {
        Reader.IsDebug = false;
        string numStr = Reader.ReadLine();
        string powStr = Reader.ReadLine();
        
        int num = int.Parse(numStr.Substring(numStr.Length - 1));
        int ans = this.getAns(num, powStr);
        
        Console.WriteLine(ans);

    }
    
    
    private Dictionary<string, int> dic = new Dictionary<string, int>();
    private int getAns(int num, string powStr) {
        string[] div2 = this.Div2(powStr);
        
        int ans = 1;
        if(div2[0].Length >= 9) {
            ans = this.getAns(num, div2[0]);
        } else {
            int pow = int.Parse(div2[0]);
            ans = (int)(Math.Pow(num, pow) % 10);
        }
        ans = ans * ans;
        if(div2[1] == "1") {
            ans = ans * num;
        }
        ans = ans % 10;
        return ans;
    }
    
    private string[] Div2(string strNum) {


        StringBuilder ans = new StringBuilder();
        int nextKeta = 0;
        for(int i=0; i<strNum.Length; i+=9) {
            int len = Math.Min(9, strNum.Length - i);
            long tmp = long.Parse(nextKeta + strNum.Substring(i, len));
            ans.Append(tmp / 2);
            nextKeta = (int)tmp % 2;
        }
        return new String[] {ans.ToString(), nextKeta.ToString()};
    }
    

    public class Reader
    {
        public static bool IsDebug = true;
        private static String PlainInput = @"




56
65


 
";
        private static System.IO.StringReader Sr = null;
        public static string ReadLine()
        {
            if (IsDebug)
            {
                if (Sr == null)
                {
                    Sr = new System.IO.StringReader(PlainInput.Trim());
                }
                return Sr.ReadLine();
            }
            else
            {
                return Console.ReadLine();
            }
        }
        public static int[] GetInt(char delimiter = ' ', bool trim = false)
        {
            string inptStr = ReadLine();
            if (trim)
            {
                inptStr = inptStr.Trim();
            }
            string[] inpt = inptStr.Split(delimiter);
            int[] ret = new int[inpt.Length];
            for (int i = 0; i < inpt.Length; i++)
            {
                ret[i] = int.Parse(inpt[i]);
            }
            return ret;
        }
    }
    static void Main()
    {
        Program prg = new Program();
        prg.Proc();
    }
}