package main

import (
	"fmt"
	"math"
)

var (
	a int
	b int
	c int
)

func resolve() string {
	countB := math.Ceil(float64(a) / float64(b))
	countC := math.Ceil(float64(a) / float64(c))
	if countB*2 < countC*3 {
		return "NO"
	}
	return "YES"
}

func main() {
	fmt.Scanf("%d\n", &a)
	fmt.Scanf("%d\n", &b)
	fmt.Scanf("%d\n", &c)
	fmt.Println(resolve())
}