import sys
input = sys.stdin.readline

N=int(input())

ANS=[[0]*N for i in range(2*N-1)]

for i in range(N):
    x=i
    y=2*N-1-x

    if i%2==0:
        for j in range(x):
            ANS[j][i]=x
            
        for j in range(y):
            ANS[2*N-2-j][i]=y

    else:
        for j in range(y):
            ANS[j][i]=y
            
        for j in range(x):
            ANS[2*N-2-j][i]=x

print(len(ANS))

for x in ANS:
    print(*x)