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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            var na = Console.ReadLine().Split().Select(int.Parse).ToArray();
            double x = (double)Math.Abs(na[0]);
            double y = (double)Math.Abs(na[1]);
            double r = (double)Math.Abs(na[2]);
            double z = x + y + r * Math.Sqrt(2.0);
            int n = (int)z + 1;
            Console.WriteLine(n);
            Console.ReadLine();
        }
    }
}