Printing Triangle

number = int(input())

def print_first_half(number):
    for i in range(1, number):
        for j in range(1, i + 1):
            print(j, end=' ')
        print()


def print_second_half(number):
    for i in range(number, 0, -1):
        for j in range(1, i + 1):
            print(j, end=' ')
        print()


print_first_half(number)
print_second_half(number)