#![allow(unused_imports)]
#![allow(non_snake_case)]
use std::collections::HashMap;
use std::collections::HashSet;

#[allow(unused_macros)]
macro_rules! read {
    ([$t:ty] ; $n:expr) =>
        ((0..$n).map(|_| read!([$t])).collect::<Vec<_>>());
    ($($t:ty),+ ; $n:expr) =>
        ((0..$n).map(|_| read!($($t),+)).collect::<Vec<_>>());
    ([$t:ty]) =>
        (rl().split_whitespace().map(|w| w.parse().unwrap()).collect::<Vec<$t>>());
    ($t:ty) =>
        (rl().parse::<$t>().unwrap());
    ($($t:ty),*) => {{
        let buf = rl();
        let mut w = buf.split_whitespace();
        ($(w.next().unwrap().parse::<$t>().unwrap()),*)
    }};
}

#[allow(dead_code)]
fn rl() -> String {
    let mut buf = String::new();
    std::io::stdin().read_line(&mut buf).unwrap();
    buf.trim_end().to_owned()
}

fn main() {
    let (x, y) = read!(isize, isize);

    let mut map0 = HashSet::new();
    let mut map1 = HashSet::new();
    let mut map2 = HashSet::new();
    let mut map3 = HashSet::new();

    map0.insert([0isize, 0isize]);
    for e in map0.iter() {
        map1.insert([e[0] - 2, e[1] - 1]);
        map1.insert([e[0] - 2, e[1] + 1]);
        map1.insert([e[0] - 1, e[1] - 2]);
        map1.insert([e[0] - 1, e[1] + 2]);
        map1.insert([e[0] + 1, e[1] - 2]);
        map1.insert([e[0] + 1, e[1] + 2]);
        map1.insert([e[0] + 2, e[1] - 1]);
        map1.insert([e[0] + 2, e[1] + 1]);
    }

    for e in map1.iter() {
        map2.insert([e[0] - 2, e[1] - 1]);
        map2.insert([e[0] - 2, e[1] + 1]);
        map2.insert([e[0] - 1, e[1] - 2]);
        map2.insert([e[0] - 1, e[1] + 2]);
        map2.insert([e[0] + 1, e[1] - 2]);
        map2.insert([e[0] + 1, e[1] + 2]);
        map2.insert([e[0] + 2, e[1] - 1]);
        map2.insert([e[0] + 2, e[1] + 1]);
    }

    for e in map2.iter() {
        map3.insert([e[0] - 2, e[1] - 1]);
        map3.insert([e[0] - 2, e[1] + 1]);
        map3.insert([e[0] - 1, e[1] - 2]);
        map3.insert([e[0] - 1, e[1] + 2]);
        map3.insert([e[0] + 1, e[1] - 2]);
        map3.insert([e[0] + 1, e[1] + 2]);
        map3.insert([e[0] + 2, e[1] - 1]);
        map3.insert([e[0] + 2, e[1] + 1]);
    }

    if map0.contains(&[x, y]) ||
       map1.contains(&[x, y]) ||
       map2.contains(&[x, y]) ||
       map3.contains(&[x, y]) {
        println!("YES");
    }
    else {
        println!("NO");
    }
}