n=int(input())
m=[[0]*n for i in range(n)]
x,y,d=0,0,0
l=[[0,1],[1,0],[0,-1],[-1,0]]
for i in range(n*n):
	s="00"+str(i+1)
	m[x][y]=s[-3:]
	xn=x+l[d][0]; yn=y+l[d][1]
	if yn>n-1 or xn>n-1 or yn<0 or xn<0 or m[xn][yn]!=0: d=(d+1)%4
	x+=l[d][0]; y+=l[d][1]
for k in m: print(*k)