package main

import (
	"fmt"
)

func main() {
	var a, b, c float64
	fmt.Scan(&a, &b, &c)
	//fmt.Println(a/c, a/b)
	if (a/c)/(a/b) <= 2.0/3.0 {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}
}