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 Go (1.6) (judge verdict: Accepted)

package main

import (
		"fmt"
)

func main() {
		var a, b int
		fmt.Scan(&a, &b)

		sum := a + b

		if sum == 3 {
				fmt.Println(3)
				return
		}

		if sum == 4 {
				fmt.Println(2)
				return
		}

		fmt.Println(1)
}