package main

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

func main() {
	stdin := bufio.NewScanner(os.Stdin)
	fmt.Print(">")
	stdin.Scan()
	a, _ := strconv.Atoi(stdin.Text())

	if a < 0 || a > 1000000 {
		return
	}

	fmt.Print(">")
	stdin.Scan()
	b, _ := strconv.Atoi(stdin.Text())

	if b < 0 || b > 1000000 {
		return
	}

	fmt.Print(">")
	stdin.Scan()
	c, _ := strconv.Atoi(stdin.Text())

	if c < 0 || c > 1000000 {
		return
	}

	if b >= c {
		return
	}

	count1 := a / b
	if a%b > 0 {
		count1 += 1
	}

	count2 := a / c
	if a%c > 0 {
		count2 += 1
	}

	// fmt.Println(count1)
	// fmt.Println(count2)

	if float64(count2)/float64(count1) <= 2.0/3.0 {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}

}