import java.util.*; public class Test11 { public static void main(String[] args){ Scanner sc=new Scanner(System.in); String[] line; line=sc.nextLine().split(" "); int x=Integer.parseInt(line[0]); int y=Integer.parseInt(line[1]); int r=Integer.parseInt(line[2]); int d=Math.abs(x)+Math.abs(y)+(int)(r*Math.sqrt(2))+1; System.out.println(d); sc.close(); } }