#![allow(unused_imports)]

use proconio::{
    fastout, input,
    marker::{Bytes, Chars, Isize1, Usize1},
    source::line::LineSource,
};
use std::cmp::{max, min, Ordering, Reverse};
use std::collections::*;
use std::{f64, i128, i32, i64, u128, u32, u64};

#[fastout]
fn main() {
    input! {
        X: i64,
        Y: i64,
        L: u64,
    }
    // let mut ans = 0u64;
    let x_count = (X.abs() as u64 + L - 1) / L;
    let y_count = (Y.abs() as u64 + L - 1) / L;
    let mut ans = 0;
    if (X > 0 && Y == 0) || (X == 0 && Y > 0) || (X == 0 && Y < 0) {
        ans += 1;
    } else if X < 0 {
        ans += 2
    }

    println!("{}", x_count + y_count + ans)
}