fun main(args: Array<String>) {
    abc078c()
}

private const val ok = 100
private const val ng = 1900

fun abc078c() {
    val (n, m) = readLine()!!.split(" ").map { it.toInt() }

    val chanceToAC = Math.pow(0.5, m.toDouble())
    val takeTime = ng * m + ok * (n - m)

    val answer = takeTime / chanceToAC

    println(answer.toLong())
}
