#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;




int main() {

	double x,y,r;
	cin>>x>>y>>r;
	double p=abs(x)+abs(y)+r*sqrt((double)2);
	int q=p;
	q++;
	cout<<q<<endl;
	return 0;
}