import java.lang.StringBuilder
import java.util.*
import kotlin.collections.ArrayList
import kotlin.math.*

fun main(args:Array<String>) {
    /*
    val t = readLine()!!.toInt()
    repeat(t) {
        solve()
    }
    */
    solve()
}

fun solve() {
    val (n, x, m) = readLine()!!.split(" ").map{it.toInt()}.toIntArray()
    val a = readLine()!!.split(" ").map{it.toInt()}.toIntArray()
    val cnt = IntArray(n)
    for (i in 0 until n) {
        while (a[i] >= x) {
            a[i] /= 2
            cnt[i]++
        }
    }
    var sum = 0L
    var mcnt = 0
    for (i in n - 1 downTo 0) {
        val cost = cnt[i] - mcnt
        if (cost > 0) {
            mcnt += cost
            sum += (i + 1) * cost
        }
    }
    println(if (sum <= m) "Yes" else "No")
}