using System;

namespace _03.SumNumbers
{
    class SumNumbers
    {
        static void Main(string[] args)
        {
            string command = Console.ReadLine();

            int sumNum = 0;

            while (command != "Stop")
            {
                int num = int.Parse(Console.ReadLine());
                sumNum += num;
                command = Console.ReadLine();
            }

            Console.WriteLine(sumNum);

        }
    }
}