#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cstring>
#include <climits>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };
 
ll MOD = 1000000007;

int dx[4] = {-1, 0, 1, 0};
int dy[4] = {0, -1, 0, 1};

int main() {
	int X, Y, L; cin >> X >> Y >> L;
	int ans;
	if (X > 0 && Y > 0) ans = 1;
	if (X > 0 && Y == 0) ans = 1;
	if (X > 0 && Y < 0) ans = 2;
	if (X == 0 && Y > 0) ans = 0;
	if (X == 0 && Y == 0) ans = 0;
	if (X == 0 && Y < 0) ans = 2;
	if (X < 0 && Y > 0) ans = 1;
	if (X < 0 && Y == 0) ans = 1;
	if (X < 0 && Y < 0) ans = 2;
	ans += (abs(X) + L - 1) / L + (abs(Y) + L - 1) / L;
	cout << ans << endl;
}