using System;
using System.Linq;

namespace _172
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
            double a = Math.Abs(x[0]) + Math.Abs(x[1]);
            a += Math.Sqrt(2) * x[2];
            Console.WriteLine(Math.Ceiling(a));
        }
    }
}