CountBeers

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class CountBeers {

    public static void main(String[] args) {

/*      Input:
        14 stacks
        5 beers
        9 stacks
        22 beers
        9 beers
        End

        Output:
        24 stacks + 16 beers

        hint: 20 beers = 1 stack */

        Scanner scan = new Scanner(System.in);
        List<String> linesList = new ArrayList<String>();
        String inputLine = scan.nextLine();
        String end = "End";
        String stacks = "stacks";
        String beers = "beers";
        int stacksCount = 0;
        int beersCount = 0;

        while(!inputLine.equals(end)){
            linesList.add(inputLine);
            inputLine = scan.nextLine();
            if (inputLine.equals(end)) {
                break;
            }
        }

        for (String line : linesList) {
            String[] lineContent = new String[2];
            lineContent = line.split(" ");

            if (lineContent[1].equals(beers)) {
                beersCount += Integer.parseInt(lineContent[0]);
                if (beersCount >= 20) {
                    stacksCount++;
                    beersCount-=20;
                }
            }
            if (lineContent[1].equals(stacks)) {
                stacksCount += Integer.parseInt(lineContent[0]);
                }
            }
            System.out.print(stacksCount + " stacks + ");
            System.out.println(beersCount + " beers");
        }
    }