num = int(input())
cnt =
max_len = [1]
for i in range(num):
    char = ''
    for j in range(i):
        if cnt < num:
            cnt +=
        else:
            break
        char = char + str(cnt) + ' '
        max_len.append(len(char))
    if len(char) > max(max_len) - 1:
        print(char.rstrip(' '))
print()