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 Ruby (2.3.3) (judge verdict: Wrong Answer)

a = gets

array =  a.split(" ")
b = array[0].to_i
c = array[1].to_i

if c>b
  box = b
  b=c
  c=box
end

for num in 1..c*b
  if c*num%b==0
  	puts c*num
    break
  end
end