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)

import scala.io.StdIn._
object Main extends App {

  val wrong = Array.fill(2){readInt()}
    Array(1,2,3).find(i ⇒ !wrong.contains(i)).foreach(println)

  implicit class Scope[T](val value: T) extends AnyVal {
    def let[A](@inline func: T ⇒ A): A = func(value)
    def also(@inline func: T ⇒ Unit): T = {func(value);value}
    def minOption[A](implicit ev: T ⇒ Iterable[A], ord: Ordering[A]): Option[A] = if (value.isEmpty) None else Some(value.min)
  }
}