package main

import (
    "fmt"
    "math"
)

func main() {
    var a, b, c int
    fmt.Scan(&a, &b, &c)

    o := float64(math.Ceil(float64(a) / float64(b)))
    p := float64(math.Ceil(float64(a) / float64(c)))

    if o * 2/3 >= p {
        fmt.Println("YES")
    } else {
        fmt.Println("NO")
    }
}