use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let a: f64 = itr.next().unwrap().parse().unwrap();
    let b: f64 = itr.next().unwrap().parse().unwrap();
    let c: f64 = itr.next().unwrap().parse().unwrap();

    let normal = a / b;
    let special = a / c;
    if special / normal <= 2.0 / 3.0 {
        println!("YES",)
    } else {
        println!("NO",)
    }
}