#include "bits/stdc++.h"
using namespace std;
#ifdef _DEBUG
#include "dump.hpp"
#else
#define dump(...)
#endif

//#define int long long
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(b)-1;i>=(a);i--)
#define all(c) begin(c),end(c)
const int INF = sizeof(int) == sizeof(long long) ? 0x3f3f3f3f3f3f3f3fLL : 0x3f3f3f3f;
const int MOD = 1'000'000'007;
template<class T> bool chmax(T &a, const T &b) { if (a < b) { a = b; return true; } return false; }
template<class T> bool chmin(T &a, const T &b) { if (b < a) { a = b; return true; } return false; }

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	double x, y, r; cin >> x >> y >> r;
	double t = sqrt(r*r / 2);
	double m = 0;
	rep(i, -1, 2)rep(j, -1, 2) {
		if (i == 0 || j == 0)continue;
		chmax(m, abs(x + t * i) + abs(y + t * j));
	}
	m += 1e-5;
	m = ceil(m) + 1e-5;
	cout << (int)m << endl;
	return 0;
}