uporyad drobi

n = int(input())
fractions = set()

for den in range(2, n+1):
    for num in range(1, den):
        a, b = num, den
        while a % b > 0:
            a, b = b, a % b
        fractions.add(f'{num//b}/{den//b}')

res = sorted(list(fractions), key=lambda x: int(x.split('/')[0]) / int(x.split('/')[1]))

for elem in res:
    print(elem)