import kotlin.math.abs

fun main() {
    val builder = StringBuilder()

    val (n, k, t) = readInputLine().split(" ").map { it.toLong() }

    builder.appendln(if ((abs(n) + k - 1L) / k <= t) "Yes" else "No")

    print(builder.toString())
}

fun readInputLine(): String {
    return readLine()!!
}