n=int(input())
dy=[0,1,0,-1]
dx=[1,0,-1,0]
def out(y,x):
    return y<0 or x<0 or n<=y or n<=x
a=[['?']*n for _ in range(n)]
c=1
i=0
y=0
x=0
while c<=n*n:
    a[y][x]='0'*(3-len(str(c)))+str(c)
    c+=1
    if n*n<c:
        break
    if out(y+dy[i],x+dx[i]) or a[y+dy[i]][x+dx[i]]!='?':
        i=(i+1)%4
    y+=dy[i]
    x+=dx[i]
for i in a:
    print(' '.join(i))