package net.ipipip0129.kotlin.yukicoder

fun main(args: Array<String>) {
    val a = readLine()!!.toDouble()
    val b = readLine()!!.toDouble()
    val c = readLine()!!.toDouble()

    val nc = Math.ceil(a / b)
    val ec = Math.ceil(a / c)

    if (ec * 1.5 <= nc) {
        println("YES")
    } else {
        println("NO")
    }
}