use std::io;

fn main() {
    // 必要経験値
    let mut a = String::new();
    io::stdin()
        .read_line(&mut a)
        .expect("failed to read input.");
    let aa = a.trim().parse::<i32>().unwrap();
    // println!("入力1: {}", aa);

    // 強化素材経験値
    let mut b = String::new();
    io::stdin()
        .read_line(&mut b)
        .expect("failed to read input.");
    let bb = b.trim().parse::<i32>().unwrap();
    // println!("入力2: {}", bb);

    // 超強化素材経験値
    let mut c = String::new();
    io::stdin()
        .read_line(&mut c)
        .expect("failed to read input.");
    let cc = c.trim().parse::<i32>().unwrap();
    // println!("入力3: {}", cc);

    // 切り上げで回数計算
    let number1 = (aa + (bb - 1)) / bb;
    let number11 = number1 as f32;
    let number2 = (aa + (cc - 1)) / cc;
    let number22 = number2 as f32;
    if number11 >= number22 * 1.5 {
        println!("YES");
    } else {
        println!("NO");
    }

}

// 時間余ればつかう
// fn read<T: std::str::FromStr>() -> T {
//     let mut s = String::new();
//     std::io::stdin().read_line(&mut s).ok();
//     s.trim().parse().ok().unwrap()
// }