#include<iostream>
#include<cmath>

using namespace std;

#define PI cos(-1.0)

int main(){

	double x,y,r;
	double sita=0;
	double max=-1;

	cin>>x>>y>>r;

	while(sita!=360){
		double xlen=abs(x+r*cos(sita*PI));
		double ylen=abs(y+r*sin(sita*PI));
		double len=xlen+ylen;

		if(len>max) max=len;
		//cout<<sita<<","<<xlen<<","<<ylen<<","<<len<<","<<max<<endl;
		sita++;
	}

	cout<<(int)max+1<<endl;
}