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

namespace _03MaximumElement
{
    class MaximumElement
    {
        static void Main(string[] args)
        {
            int queryCount = int.Parse(Console.ReadLine());
            Stack<int> stackNums = new Stack<int>();
            for (int i = 0; i < queryCount; i++)
            {
                int[] query = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
                switch (query[0])
                {
                    case 1:
                        stackNums.Push(query[1]);
                        break;
                    case 2:
                        stackNums.Pop();
                        break;
                    case 3:
                        Console.WriteLine(stackNums.Max());
                        break;
                }
            }
        }
    }
}