import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;

public class Main {
	public static void main(String[] args) {
	      BufferedReader stdReader =new BufferedReader(new InputStreamReader(System.in));
	      try {
	    	  BigInteger n = new BigInteger(stdReader.readLine());
	    	  BigInteger m = new BigInteger(stdReader.readLine());
	    	  System.out.println(n.modPow(n, new BigInteger("10")));
	      } catch (IOException e) {
			e.printStackTrace();
	      }
	}
}