
fun main(args:Array<String>):Unit {
    while(true){
        val (n, m, p) = readLine()!!.split(' ').map(String::toInt)
        if (n == 0 && m == 0 && p == 0) return
        val buy = Array(n){readLine()!!.toInt()}
        val winner = buy[m - 1]
        println(if (winner != 0) buy.sum() * (100 - p) / winner else 0)
    }
}
