Problem:
Score: 100 points

Problem Statement

Takahashi is solving quizzes. He has easily solved all but the last one.

The last quiz has three choices: 1, 2, and 3.

With his supernatural power, Takahashi has found out that the choices A and B are both wrong.

Print the correct choice for this problem.

Constraints

Each of the numbers A and B is 1, 2, or 3.

A and B are different.

Input

Input is given from Standard Input in the following format:

A
B

Output

Print the correct choice.

Sample Input 1

3
1

Sample Output 1

2

When we know 3 and 1 are both wrong, the correct choice is 2.

Sample Input 2

1
2

Sample Output 2

3

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Wrong Answer)

import java.io.*;
import java.util.*;
 
public class Main {
 
	void submit() {
	    int A = nextInt();
	    int B = nextInt();

	    if(A == 1 && B == 2){
            out.println(3);
	    }else if(A == 2 && B == 3){
            out.println(1);	        
	    }else{
            out.println(2);	        
	    }
	}

	void preCalc() {
 
	}
 
	void stress() {
 
	}
 
	void test() {
 
	}
 
	Main() throws IOException {
		br = new BufferedReader(new InputStreamReader(System.in));
		out = new PrintWriter(System.out);
		preCalc();
		submit();
		//stress();
		//test();
		out.close();
	}
 
	static final Random rng = new Random();
 
	static int rand(int l, int r) {
		return l + rng.nextInt(r - l + 1);
	}
 
	public static void main(String[] args) throws IOException {
		new Main();
	}
 
	BufferedReader br;
	PrintWriter out;
	StringTokenizer st;
 
	String nextToken() {
		while (st == null || !st.hasMoreTokens()) {
			try {
				st = new StringTokenizer(br.readLine());
			} catch (IOException e) {
				throw new RuntimeException(e);
			}
		}
		return st.nextToken();
	}
 
	String nextString() {
		try {
			return br.readLine();
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
 
	int nextInt() {
		return Integer.parseInt(nextToken());
	}
 
	long nextLong() {
		return Long.parseLong(nextToken());
	}
 
	double nextDouble() {
		return Double.parseDouble(nextToken());
	}
}