#include <bits/stdc++.h>
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repr(i, a, n) for (int i = n - 1; i >= a; i--)
using namespace std;
using ll = long long;
using P = pair<int, int>;
template <typename T> void chmin(T &a, T b) { a = min(a, b); }
template <typename T> void chmax(T &a, T b) { a = max(a, b); }

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

  int x, y, r;
  cin >> x >> y >> r;
  x = abs(x), y = abs(y);
  int ans = ceil((x + sqrt(2) * r / 2) + (y + sqrt(2) * r / 2));
  cout << ans << endl;
}