use std::io::*;
use std::str::FromStr;
//use std::num;
//use std::cmp;

const CHARSET: &str = "ABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZABCDEFGHIJKLMNOPQRSTUVWXYZ";

fn main() {
	let mut x: isize = read();
	let mut y: isize = read();
	let l: isize = read();
	let round: isize;
	let mut advance: isize = 0;

	if x > 0 && y > 0{
		round = 1;
	}else if x > 0 && y < 0{
		round = 2;
	}else if x < 0 && y > 0{
		round = 1;
	}else if x < 0 && y < 0{
		round = 2;
	}else if x == 0 && y > 0{
		round = 0;
	}else if x == 0 && y < 0{
		round = 2;
	}else if x > 0 && y == 0{
		round = 1;
	}else{
		round = 1;
	}

	if x < 0{
		x *= -1;
	}

	if y < 0{
		y *= -1;
	}

	if x % l == 0 && y % l == 0{
		advance = x / l + y / l;
	}else if x % l == 0 && y % l != 0{
		advance = x / l + y / l + 1;
	}else if x % l != 0 && y % l == 0{
		advance = x / l + y / l + 1;
	}else if x % l != 0 && y % l != 0{
		advance = x / l + y / l + 2;
	}

	print!("{}",round + advance);
}
/*
pub fn get_string_from_position(x: usize, i:usize) -> String {

}
*/

pub fn get_position(x: String) -> usize {
	let result = CHARSET.find(&x);
	let answer;

	if let Some(index) = result {
		answer = index;
	} else {
		answer = 0;
	}

	answer
}

pub fn upper_lower(x: char) -> char {
	let result: char;

	if x.is_uppercase() {
		result = x.to_ascii_lowercase();
	} else if x.is_lowercase() {
		result = x.to_ascii_uppercase();
	} else {
		result = x;
	}

	result
}

pub fn max_2(x: usize, y: usize) -> usize{
	let result;
	
	if x >= y{
		result = x;
	}else{
		result = y;
	}

	result
}

pub fn max_3(x: isize, y: isize, z: isize) -> isize {
	let result;
	if x >= y && y >= z {
		result = x;
	} else if x >= z && z >= y {
		result = x;
	} else if y >= x && x >= z {
		result = y;
	} else if y >= z && z >= x {
		result = y;
	} else if z >= x && x >= y {
		result = z;
	} else {
		result = z;
	}

	result
}

pub fn min(x: isize, y: isize, z: isize) -> isize {
	let result;
	if x <= y && y <= z {
		result = x;
	} else if x <= z && z <= y {
		result = x;
	} else if y <= x && x <= z {
		result = y;
	} else if y <= z && z <= x {
		result = y;
	} else if z <= x && x <= y {
		result = z;
	} else {
		result = z;
	}

	result
}

pub fn read_line() -> String {
	let mut s: String = String::new();
	std::io::stdin().read_line(&mut s).ok();

	s
}

pub fn read<T: FromStr>() -> T {
	let stdin = stdin();
	let stdin = stdin.lock();
	let token: String = stdin
		.bytes()
		.map(|c| c.expect("failed to read char") as char)
		.skip_while(|c| c.is_whitespace())
		.take_while(|c| !c.is_whitespace())
		.collect();
	token.parse().ok().expect("failed to parse token")
}

pub fn read_array() -> Vec<char> {
	let array: String = read();
	let chars: Vec<char> = array.trim().chars().collect::<Vec<char>>();
	chars
}

pub fn get_data() -> Vec<u64> {
	let mut s: String = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let vec: Vec<u64> = s
		.trim()
		.split_whitespace()
		.map(|e| e.parse().ok().unwrap())
		.collect();

	vec
}

pub fn get_chars() -> Vec<char> {
	let mut s: String = String::new();
	std::io::stdin().read_line(&mut s).ok();

	let vec: Vec<char> = s.trim().chars().collect::<Vec<char>>();

	vec
}