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;

class Pg
{
    static void Main()
    {
        Read0100().ToList().ForEach(delegate (IEnumerable<IEnumerable<int>> Data)
        {
            var ans =Data.GroupBy(x => x.First())
            .Where(g => g.Sum(x => x.Skip(1).First() * x.Last()) >= 1000000)
            .Select(x => x.Key);
            Console.WriteLine(ans.Count() != 0 ? string.Join("\n", ans) : "NA");
        });
    }
    private static IEnumerable<IEnumerable<IEnumerable<int>>> Read0100()
    {
        int n;
        while ((n = int.Parse(Console.ReadLine())) != 0)
        {
            var selllst = new List<IEnumerable<int>>();
            while (n-- > 0)
                selllst.Add(Console.ReadLine().Split().Select(int.Parse));
            yield return selllst;
        }
    }
}