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

namespace Cviceni1 {
    class Program {
        static void Main(string[] args) {
            int suma = 0;
            int d;

            foreach (string n in Console.ReadLine().Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)) {
                if (int.TryParse(n, out d)) {
                    suma += d;
                }
            }

            Console.WriteLine(suma.ToString());
            Console.ReadLine();
        }
    }
}