using System;
using System.Linq;
using System.IO;
using System.Text;
using System.Collections;
using System.Collections.Generic;

class lecture
{
    public static void Main(string[] args)
    {
        string[] A = Console.ReadLine().Split();
        int x = int.Parse(A[0]);
        int y = int.Parse(A[1]);
        int z = int.Parse(A[2]);

        x = Math.Abs(x);
       y =  Math.Abs(y);

        int kyori = (int)(x + y + Math.Sqrt(2)*z +1);
       
        Console.WriteLine(kyori);

    }
}