use std::collections::{HashMap, HashSet};

fn main() {
    proconio::input! {
        a: u128,
        b: u128,
    }
    let add = a + b;
    let mul = a * b;
    println!("{}", gcd(add, mul));
}

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