k=int
n=k(input())
l=[i for i in range(1,n*n+1)]
d=[1,n,-1,-n]
p=1
q=n-1
c=n+1
m=n-0.5
while k(m):
 for i in [0]*k(m):l[q+d[p]]=c;c+=1;q+=d[p]
 p=(p+1)%4
 m-=0.5
for i in range(n):
 for j in range(n):
  print("%03d"%l[i*n+j],end="")
  if j!=n-1:print(" ",end="")
 print()