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, c int
	fmt.Scanf("%d", &a)
	fmt.Scanf("%d", &b)
	if a > b {
		c = a
		a = b
		b = c
	}
	if a == 1 && b == 2 {
		c = 3
	} else if a == 2 && b == 3 {
		c = 1
	} else {
		c = 2
	}
	fmt.Printf("%d\n", c)
}