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 Kotlin (1.0.0) (judge verdict: Accepted)

fun main(args :Array<String>) {
    val a = readInteger()
    val b = readInteger()
    if (a == 1) {
        when (b) {
            2 -> 3
            3 -> 2
            else -> 0
        }.let { println(it) }
    } else if (a == 2) {
        when (b) {
            1 -> 3
            3 -> 1
            else -> 0
        }.let { println(it) }
    } else {
        when (b) {
            1 -> 2
            2 -> 1
            else -> 0
        }.let { println(it) }
    }
}

fun readInteger() = readLine()!!.toInt()
fun readStringList() = readLine()!!.split(" ")
fun readIntegerList() = readStringList().map(String::toInt)
fun readLongList() = readStringList().map(String::toLong)