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 (1.14.1) (judge verdict: Accepted)

package main

import "fmt"

func main() {
	var A, B int
	fmt.Scanf("%d", &A)
	fmt.Scanf("%d", &B)

	for i := 0; i < 3; i++ {
		if A-1 == i || B-1 == i {
			continue
		} else {
			fmt.Println(i + 1)
		}
	}
}