using System;
using System.Collections.Generic;
using System.Linq;

namespace Stack_sum
{
    class Program
    {
        static void Main(string[] args)
        {
            var input=Console.ReadLine().Split(' ').Select(int.Parse);
            Stack<int> stack = new Stack<int>(input);
            var command = Console.ReadLine().ToLower().Trim();
            while(command!="end")
            {
                var tokens = command.Split();
                var toDo = tokens[0].ToLower();
                if(toDo=="add")
                {
                    stack.Push(int.Parse(tokens[1]));
                    stack.Push(int.Parse(tokens[2]));
                }
                else if(toDo=="remove")
                {
                    var numbersToRemove = int.Parse(tokens[1]);
                    if(stack.Count<numbersToRemove)
                    {
                        continue;
                    }
                    for (int i = 0; i < numbersToRemove; i++)
                    {
                        stack.Pop();
                    }
                }
                command = Console.ReadLine();
            }
            var sum = stack.Sum();
            Console.WriteLine($"Sum: {sum}");
        }
    }
}