import scala.collection.mutable._
 
object Main extends App{
    val sc = new java.util.Scanner(System.in)
    val N, A, B = sc.nextInt
    val in = Array.fill(N)(sc.nextInt)
    
    def solve(hps: Array[Int], cnt: Int): Int = {
        if (hps.forall(_<=0)) {
            return cnt
        }
        
        val hps_sorted = hps.filter(_>0).sorted
        val c = hps_sorted.head / (100*A) + 1
        val hps_new = for((hp, i) <- hps_sorted.zipWithIndex) yield {
            if (i == hps_sorted.size-1) {
                hp - A*c
            } else {
                hp - B*c
            }
        }
        solve(hps_new, cnt+c)
 
    }
    
    println(solve(in, 0))
}   
 