import sys
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
#####################################################################
"""

n = 3
n - 1
n - 2

x 9 x 16 x

x 1 x 3 x 5 x 7 x 9 x


"""

n = ni()

print(n * 2 - 3)
for i in range(1, n):
    print(i, i + 1, 2 * i - 1)

for i in range(3, n + 1):
    print(2, i, 2 * i - 2)


for i in range(1, n):
    for j in range(i + 1, n + 1):
        if i == 1:
            print(j - i, *[t + 1 for t in range(j - i)])
        else:
            print((i - 2) + 1 + (j - i - 1), *([i - t - 1 for t in range(i - 2)] + [n + i - 2] + [t + i + 1 for t in range(j - i - 1)]))