N = int(input())

ans_list = [[2*N-1] for _ in range(2*N-1)]
for i in range(2*N-1):
    if i==0:
        ans_list[i].append(1)
    else:
        ans_list[i].append(2*N-2)

for i in range(2, N):
    maxi = 2 * i + 1
    for j in range(maxi):
        if j+i<maxi:
            ans_list[j].append(2*N-1-i)
        else:
            ans_list[j].append(i)
    for j in range(maxi, 2*N-1):
        ans_list[j].append(2*N-1-i)

print(len(ans_list))
for a in ans_list:
    print(*sorted(a))