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 Haskell (GHC 7.10.3) (judge verdict: Accepted)

main = do
  a <- readLn
  b <- readLn
  print $ func a b

func a b 
  | (a == 1 && b == 2) || (a == 2 && b == 1) = 3
  | (a == 1 && b == 3) || (a == 3 && b == 1) = 2
  | otherwise = 1