package Yukicoder

/**
 * Created by hichikawa on 2015/11/02.
 */
fun main(args: Array<String>) {
    fun readLineLongArray() : List<Long> {
        val str = readLine() as String
        val arrStr = str.split(" ")
        val ret = arrStr.map { it.toLong() }
        return ret
    }
    fun readLineLong() : Long {
        val str = readLine() as String
        return str.toLong()
    }
    val intX = readLineLong()
    val intY = readLineLong()
    val intL = readLineLong()
    var count = Math.abs(intX) / intL + Math.abs(intY) / intL
    if (Math.abs(intX) % intL > 0)
        count += 1
    if (Math.abs(intY) % intL > 0)
        count += 1

    if (intY < 0) {
        println(count+2)
    } else if (intX != 0.toLong()) {
        println(count+1)
    } else {
        println(count)
    }
}