#include <bits/stdc++.h> #define rep(i,a,b) for(int i=a;i<(b);++i) #define erep(i,a,b) for(int i=a;i<=(int)(b);++i) #define per(i,a,b) for(int i=(a);i>(b);--i) #define eper(i,a,b) for(int i=(a);i>=b;--i) #define pb push_back #define mp make_pair #define INF 100100100100 #define MOD 1000000007 #define ALL(x) begin(x),end(x) using namespace std; using ll = long long; using pii = pair<int,int>; using vii = vector<int>; using vll = vector<ll>; template<class T>using vv = vector<T>; template<class T>bool chmax(T &a, const T &b) { if (a<b) { a = b; return 1; } return 0; } template<class T>bool chmin(T &a, const T &b) { if (b<a) { a = b; return 1; } return 0; } int dy[]={0, 0, 1, -1}; int dx[]={1, -1, 0, 0}; int gcd(int a,int b){return b?gcd(b,a%b):a;} int lcm(int a,int b){return a/gcd(a, b)*b;} double x, y, r; int main() { cin.tie(0); ios::sync_with_stdio(false); cin >> x >> y >> r; x = abs(x), y = abs(y); double _x = x + sqrt(2) * r; double _y = y; cout << ceil(_x + _y) << endl; return 0; }