#include <bits/stdc++.h>
#include <iostream>
using namespace std;
//ios::sync_with_stdio(0);cin.tie(nullptr);
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define rep(i,a,b) for(LL i = a;i<b; i++)
#define rrep(i,a,b) for(LL i = a;i>b; i--)
#define tobirep(i,a,b,c) for(LL i = a;i<b; i+=c)
#define tobirrep(i,a,b,c) for(LL i = a;i>b; i-=c)
#define INF ((1LL<<62)-(1LL<<31))
#define ooki 9223372036854775807
#define tii -9223372036854775808
typedef long long LL;
int main(){
  ios::sync_with_stdio(0);cin.tie(nullptr);
  LL x,y,l,ans=0;
  cin >> x >> y >> l;
  if(y<0){ans+=2;}
  else if(x!=0){ans++;}
  ans+=(abs(x)+abs(y)+l-1)/l;
  cout << ans << '\n';
       
}