"use strict";
//テストの入力を受け取る
const input=Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//const input = ("-7\n15\n7");
function countStep(latlngLength, stepLength) {
    if (latlngLength === 0) {
        return 0;
    }
    else {
        return Math.abs(Math.ceil(latlngLength / stepLength));
    }
}
const [X, Y, L] = input.split("\n").map(i => Number(i));
let turn = 0;
if (Y < 0) {
    //S,SE,SW add two step
    turn += 2;
}
else if (X != 0) {
    //NE,NW add one step
    ++turn;
}
const XStep = countStep(X, L);
const YStep = countStep(Y, L);
console.log(turn + XStep + YStep);
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