N = int(input())
for i in range(N):
	for j in range(N):
		print(i + 1 if (i + j) % 2 == 0 else j + 1, end = "\n" if j == N - 1 else " ")
for i in range(N):
	for j in range(N):
		print(j + 1 if (i + j) % 2 == 0 else i + 1, end = "\n" if j == N - 1 else " ")