#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please


int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int X, Y, L;
	cin >> X >> Y >> L;

	int kazu = 0;
	if (Y < 0) kazu += 2;
	else if (X) kazu++;
	kazu += (abs(X) + L - 1) / L;
	kazu += (abs(Y) + L - 1) / L;

	co(kazu);

	Would you please return 0;
}