use std::cmp::{max, min};

fn gcd(x: usize, y: usize) -> usize {
    if x % y == 0 { return y; }
    gcd(y, x % y)
}

//TODO
fn main() {
    let mut ab = String::new();
    std::io::stdin().read_line(&mut ab).ok();
    let ab: Vec<usize> = ab.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let a = ab[0];
    let b = ab[1];

    let gcd_val = gcd(max(a, b), min(a, b));
    let sq: usize = (gcd_val as f64).sqrt().round() as usize;
    println!("{}", if sq * sq == gcd_val { "Odd" } else { "Even" });
}