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;

fn main() {
	let mut buf = String::new();
	io::stdin().read_line(&mut buf).expect("");
	let a:i32 = match buf.trim().to_string().parse() {
		Ok(n) => n,
		_ => panic!(""),
	};
	let mut buf = String::new();
	io::stdin().read_line(&mut buf).expect("");
	let b:i32 = match buf.trim().to_string().parse() {
		Ok(n) => n,
		_ => panic!(""),
	};
	let mut v = vec![1, 2, 3];
	v[(a-1) as usize] = 0;
	v[(b-1) as usize] = 0;
	for num in v {
		if num != 0 {
			println!("{}", num);
		}
	}
}