using System;
using System.Collections.Generic;
using System.Linq;

class Magatro
{
   static void Main() {
        int[] q = Console.ReadLine().Split(' ').Select(s => int.Parse(s)).ToArray();
        int ans = (int)Math.Ceiling(Math.Sqrt(2)*q[2]) + Math.Abs(q[1]) + Math.Abs(q[0]);
        Console.WriteLine(ans);
    }
}