Beers

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


class Beers
{
    static void Main()
    {
        string[] input = Console.ReadLine().Split(' ');
        int beers = 0;
        int stacks = 0;

        while (input[0] != "End")
        {
            if (input[1] == "beers")
            {
                beers += Int32.Parse(input[0]);
            }
            else
            {
                stacks += int.Parse(input[0]);
            }
            input = Console.ReadLine().Split(' ');
        }
        stacks += beers / 20;
        beers %= 20;
        Console.WriteLine("{0} stacks + {1} beers", stacks, beers);
    }
}