'''****** Задание ********
  *Новогоднее настроение.
'''
count = int(input())
num = 1
row = 2
print(num)
while num < count:
    for i in range(1, row + 1):
        if num + i <= count:
            print(num + i, end=" ")
    row += 1
    print()
    num = num + row - 1