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 Rust (1.15.1) (judge verdict: Accepted)

use std::io::{self, Read};

fn main() {
	let mut input = String::new();
	let _ = io::stdin().read_to_string(&mut input);
	let lines: Vec<&str> = input.split("\n").collect();
	let a = lines[0].parse::<i32>().unwrap();
	let b = lines[1].parse::<i32>().unwrap();
	
	println!("{}",6 - a - b);
}