N = int(input())

print(2*N-1)

p = [[str(2*N-1)] for i in range (0, 2*N-1)]

if N == 1:
    print(1)
    exit()
if N == 2:
    print('3 2')
    print('3 2')
    print('3 1')
    exit()

import collections as col

d = col.deque()

for i in range (0, 2*N-2):
    q = 2*N-2-i
    for j in range (0, q):
        d.append(str(q))

for i in range (0, (N-2)*(2*N-1)):
    p[i%(2*N-1)].append(d.popleft())

ikkai = set()
mate = set()

import copy

for i in range (0, 2*N-1):
    c = 0
    s= "".join(p[i])
    while c == 0:
        q = d.popleft()
        u = str(q)
        s+=u
        if s not in mate:
            if s not in ikkai:
                ikkai.add(s)
            else:
                mate.add(s)
            c = 1
            p[i].append(q)
        else:
            s = s[:-1]
            d.append(q)

for i in range (0, len(p)):
    v = []
    for j in range (0, len(p[i])):
        v.append(int(p[i][j]))
    print(*v)