import java.util.*

fun main(args: Array<String>) {
    val cin = Scanner(System.`in`)
    var N = cin.nextLong()
    var K = cin.nextLong()

    if(N <= K) println(1)
    else {
        var KK = K + 1
        var ans = (N + KK) / KK
        println(ans)
    }
}