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)

n = gets.to_i

if n < 2 
  puts 0
else
  if n % 2 != 0
    puts 0
  else
    limit = 5
    array = []

    while n / limit >= 1
      array.push(limit * 2)
      limit *= 5
    end
    
    sum = 0
    array.each do |number|
      sum += n / number
    end

    puts sum
  end
end