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: Wrong Answer)

package main

import "fmt"

func main() {
	var a, b int
	slice := []int{1,2,3}
	ans := []int{}

	fmt.Scanf("%d %d", &a, &b)
	for i := 0;i < len(slice);i++ {
		if (slice[i] != a && slice[i] != b) {
			ans = append(ans, slice[i])
		}
	}

	if (len(ans) > 0) {
		fmt.Printf("%d", ans[0])
	}
}