N=int(input())
A=[[-1 for _ in range(N)] for _ in range(N)] 

d=0#direction
i=0
j=-1# it should be -1 to start with 0,0
c=0

while c<N*N and d<N*N:
    s,t=i,j #for undo 
    if   d%4==0 :j+=1
    elif d%4==1 :i+=1
    elif d%4==2 :j-=1
    else        :i-=1
    
    if i<0 or N-1<i or j<0 or N-1<j or A[i][j]!=-1:
        i,j=s,t#undo
        d+=1
    else:
        A[i][j]=c
        c+=1
    

for a in A:
    for x in a:print('%03d'%(x+1),end=' ')
    print()