use proconio::input;

fn main() {
    input! {
        a:isize, b:isize,
    }
    let max_ok_dish = a.min(b) * 2;
    let min_ng_dish = a + b - max_ok_dish;
    if max_ok_dish >= min_ng_dish {
        let ans = (a + b) % 2;
        println!("{}", ans);
        return;
    }
    let ans = min_ng_dish - max_ok_dish;
    println!("{}", ans);
}