Problem:
Sale Result

There is data on sales of your company. Your task is to write a program which identifies good workers.

The program should read a list of data where each item includes the employee ID i, the amount of sales q and the corresponding unit price p. Then, the program should print IDs of employees whose total sales proceeds (i.e. sum of p × q) is greater than or equal to 1,000,000 in the order of inputting. If there is no such employees, the program should print "NA". You can suppose that n < 4000, and each employee has an unique ID. The unit price p is less than or equal to 1,000,000 and the amount of sales q is less than or equal to 100,000.

Input

The input consists of several datasets. The input ends with a line including a single 0. Each dataset consists of:

n (the number of data in the list)
i p q
i p q
:
:
i p q

Output

For each dataset, print a list of employee IDs or a text "NA"

Sample Input

4
1001 2000 520
1002 1800 450
1003 1600 625
1001 200 1220
2
1001 100 3
1005 1000 100
2
2013 5000 100
2013 5000 100
0

Output for the Sample Input

1001
1003
NA
2013

Solution in C# (judge verdict: Accepted)

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

namespace AOJ.Volume1
{
    class SaleResult
    {
        public static void Main()
        {
            while (true)
            {
                int line_cnt = int.Parse(Console.ReadLine());
                if (line_cnt == 0) { break; }

                var emp = new Dictionary<int, ulong>();
                for (int i = 0; i < line_cnt; i++)
                {
                    var input = Console.ReadLine().Split(' ');
                    int id = int.Parse(input[0]);
                    int price = int.Parse(input[1]);
                    int qty = int.Parse(input[2]);

                    if (emp.ContainsKey(int.Parse(input[0]))) { emp[id] += (ulong)(price * qty); }
                    else { emp.Add(id, (ulong)(price * qty)); }
                }

                bool na = true;
                foreach (var e in emp)
                {
                    if (e.Value >= 1000000)
                    {
                        Console.WriteLine(e.Key);
                        na = false;
                    }
                }
                if (na) { Console.WriteLine("NA"); }
            }
        }
    }
}