"use strict";
//テストの入力を受け取る
function Main(input) {
    function countStep(latlngLength, stepLength) {
        if (latlngLength === 0) {
            return 0;
        }
        else {
            return Math.ceil(Math.abs(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);
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));
//Main("0\n-1\n1000000000");
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