fun main() {
    val (n, p) = readLine()!!.trim().split(' ').let{(n, p) -> n.toInt() to p.toDouble()}
    val notRemoveProb = DoubleArray(n + 1){1.0}
    for (i in 2 .. n) {
        for (j in 2 .. n / i) {
            notRemoveProb[i * j] *= (1 - p)
        }
    }
    val result = notRemoveProb.drop(2).sum()
    println("%.10f".format(result))
}