#![allow(non_snake_case)]

use std::io::{ self, prelude::* };

macro_rules! pick {
    ($tokens:expr) => {
        $tokens.next().unwrap().parse().expect("parse error")
    }
}

fn gcd(a: u128, b: u128) -> u128 {
    if b == 0 { return a; }
    gcd(b, a%b)
}

fn main() {
    let mut s = String::new();
    io::stdin().read_to_string(&mut s).expect("i/o error");
    let mut tokens = s.split_whitespace();

    let A: u128 = pick!(tokens);
    let B: u128 = pick!(tokens);

    let ans = gcd(A+B, A*B);

    println!("{}", ans);
}