import java.math.BigInteger; import java.util.*; public class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); int n=sc.nextInt(); int m = sc.nextInt(); int r = sc.nextInt(); double waa = 1/Math.sqrt(2); System.out.println(Math.abs(n)+Math.abs(m)+(int)(Math.ceil(r/waa))); } }