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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.util.*;

class Main {
    public static void main(String[] args) {
      Scanner sc = new Scanner(System.in);
      int A = sc.nextInt();
      int B = sc.nextInt();

      int a = 1;
      int b = 2;
      int c = 3;

      if (A==a) {
        a = 0;
      } else if (A==b) {
        b = 0;
      } else if (A==c) {
        c = 0;
      }
      if (B==a) {
        a = 0;
      } else if (B==b) {
        b = 0;
      } else if (B==c) {
        c = 0;
      }
      System.out.println(a+b+c);

    }      
}