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 (GNU Fortran 9.2.1) (judge verdict: Accepted)

program sample
	implicit none
    integer :: x,y
    
    read(*,*) x
    read(*,*) y
    
    if (x==1 .and. y==2) then
    	write(*,*) 3
    else if (x==1 .and. y==3) then
    	write(*,*) 2
    else if (x==2 .and. y==1) then
    	write(*,*) 3        
    else if (x==2 .and. y==3) then
    	write(*,*) 1        
    else if (x==3 .and. y==1) then
    	write(*,*) 2        
    else if (x==3 .and. y==2) then
    	write(*,*) 1        
	end if

    stop
end program sample