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 Fortran (gfortran v4.8.4) (judge verdict: Accepted)

program main
  implicit none
  
  integer :: a,b
  read(*,*)a,b
  
  if ((a == 1) .and. (b == 2)) then
    write(*,*)3
  else if ((a == 1) .and. (b == 3)) then
    write(*,*)2
  else if ((a == 2) .and. (b == 1)) then
    write(*,*)3
  else if ((a == 2) .and. (b == 3)) then
    write(*,*)1
  else if ((a == 3) .and. (b == 1)) then
    write(*,*)2
  else if ((a == 3) .and. (b == 2)) then
    write(*,*)1
  end if
end program main