Calculate the run-time efficiency of the following program segment (three nested loops):

i = 1
loop (i <= n)
  j = 1
  loop (j <= n)
    k = 1
    loop (k <= n)
      print(i, j, k)
      k = k + 1
    end loop
    j = j + 1
  end loop
  i = i + 1
end loop