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 Ruby (judge verdict: Accepted)

class EmployeeRecord
  NUM_EMPLOYEE = 4000
  MILLION = 1000000
  
  def initialize
    @sales = Array.new(NUM_EMPLOYEE + 1).fill(0, 0...(NUM_EMPLOYEE+1))
  end
  
  def updateSales(id, newSales)
    @sales[id] += newSales
  end
  
  def printIdOverMillionSales(idSet)
    count = 0
    for i in 0...idSet.size
      if @sales[idSet[i]] >= MILLION
        count += 1
        puts idSet[i]
      end
    end
    puts "NA"   if count == 0
  end
end

employee = nil
while true
  n = gets.to_i
  idSet = Array.new
  break   if n == 0
  employee = EmployeeRecord.new
  n.times do
    input = gets.split(" ")
    id = input[0].to_i
    idSet << id   if idSet.index(id) == nil
    price = input[1].to_i
    numItems = input[2].to_i
    employee.updateSales(id, price * numItems)
  end
  employee.printIdOverMillionSales(idSet)
end