using System;

    public class Program

    {

        public static void Main()

        {

            string input = Console.ReadLine();

            string[] myArr = input.Split(' ');

​

            int result = 0;

            int x;

​

            foreach (string item in myArr)

​

            {

//Console.WriteLine(item);

                bool success = int.TryParse(item, out x);

                if (success)

                {

                    result = x + result;

                }

                  }

            Console.WriteLine(result);

​

        }

​

    }

​

​