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 Scala (2.11.7) (judge verdict: Accepted)

object Main extends App {
  val a = scala.io.StdIn.readInt()
  val b = scala.io.StdIn.readInt()
  if ((a == 1 && b == 2) || (a == 2 && b == 1)) {
    println(3)
  } else if((a == 1 && b == 3) || (a == 3 && b == 1))  {
    println(2)
  } else {
    println(1)
  }

}