using System;
using System.Security.Cryptography;

namespace _10.MultiplyEvenByOdds
{
    class Program
    {
        static void Main()
        {
            string givenNumber = Console.ReadLine();
            int number = 0;
            int evenSum = 0;
            int oddSum = 0;

            if (givenNumber[0] == '-')
            {

                for (int i = 1; i < givenNumber.Length; i++)
                {
                    number = (int)givenNumber[i];
                    if (number % 2 == 0)
                    {
                        evenSum += number;
                    }
                    else
                    {
                        oddSum += number;
                    }
                }
            }