n = int(input())
r = [[] for _ in range(n)]
W = 2*n-1
for i in range(n-1):
    v = W-i
    r[i].extend([v]*v)
    r[i].extend([W-v+2]*(W-v))
for i in range(3,W-v+3)[::-1]:
    r[-1].extend([i]*2)
r[-1].extend([2,2,1])

print(W)
for lst in zip(*r):
    print(*lst)