using System;

public class Program

{

    public static void Main()

    {

        int num,sum;

        sum=0;

        num=int.Parse(Console.ReadLine());

        while(num%2==0)

        {

            sum=sum+num;

            num=int.Parse(Console.ReadLine());

        }

        Console.WriteLine("sum:{0}",sum);

    }

}