#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<ll> vll;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<vector<ll>> vvll;
const ll inf = 1e16;
const ll md = 1000000007;

int main() {
  float x,y,r;
  cin >> x>>y>>r;
  x=abs(x)+sqrt(2)*r/2;
  y=abs(y)+sqrt(2)*r/2;
  int ans=0;
  for(;;ans++) if (ans>x+y) break;
  cout<<ans<<endl;
  return 0;
}