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 PHP (5.6.30) (judge verdict: Accepted)

<?php
  fscanf(STDIN, "%d", $A);
  fscanf(STDIN, "%d", $B);
 if($A == 1 && $B ==2 || $A == 2 && $B ==1){
 echo 3;
 }else if($A == 2 && $B ==3 || $A == 3 && $B ==2){
   echo 1;
 }
else{
  echo 2;
}
   ?>