TaskA

import java.util.Scanner;
import java.util.Stack;

public class TaskA {

    public static Stack<Car> stack = new Stack<>();

    public static void add(int count, String load) {
            stack.push(new Car(count, load));
    }

    public static void delete(int count) {
        while (count!=0) {
            if (stack.peek().count<count) {
                count-=stack.peek().count;
                stack.pop();
            } else {
                stack.peek().count-=count;
                count=0;
            }
        }
    }

    public static int get(String load) {
        int count = 0;
        for (int i = 0; i < stack.size(); i++) {
            if (stack.get(i).load.equals(load)) {
                count+=stack.get(i).count;
            }
        }
        return count;
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        for (int i = 0; i<=n; i++) {
            String str=in.nextLine();
            String[] split = str.split(" ");
            if (split[0].equals("add")) {
                add(Integer.parseInt(split[1]), split[2]);
                continue;
            }
            if (split[0].equals("delete")) {
                delete(Integer.parseInt(split[1]));
                continue;
            }
            if (split[0].equals("get")) {
                System.out.println(get(split[1]));
                continue;
            }
        }

    }
    public static class Car {
        int count;
        String load;
        public Car(int count, String load) {
            this.count=count;
            this.load=load;
        }
    }

}