fn read() -> usize {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse::<usize>().unwrap()
}

fn main() {
    let a = read();
    let b = read();
    let c = read();

    println!("{}",
        if (a + c - 1) / c > (a + b - 1) / b * 2 / 3 {
            "NO"
        } else {
            "YES"
        }
    );
}