package main

import(
	"fmt"
	"os"
	"bufio"
	"strconv"
)

var sc = bufio.NewScanner(os.Stdin)

func main() {
	ep, epForNormal, epForSpecial := nextLine(), nextLine(), nextLine()
	normalTimes := float64(ep / epForNormal)
	specialTimes := float64(ep / epForSpecial)
	a := specialTimes / normalTimes
	b := 0.6666666666666666

	if a > b {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}
}

func nextLine() int64 {
    sc.Scan()
	i, _ := strconv.Atoi(sc.Text())
	return int64(i)
}