n=int(input()) a=[[0]*n for x in range(n)] num = 1 x,y = 0,n-1 while num<=n**2: while 0<=x<=n-1 and 0<=y<=n-1 and a[x][y]==0: a[x][y]=num x+=1 num=num+1 x=x-1 y=y-1 while 0<=x<=n-1 and 0<=y<=n-1 and a[x][y]==0: a[x][y]=num y=y-1 num=num+1 x=x-1 y=y+1 while 0 <= x <= n - 1 and 0 <= y <= n - 1 and a[x][y] == 0: a[x][y]=num x=x-1 num=num+1 x=x+1 y=y+1 while 0 <= x <= n - 1 and 0 <= y <= n - 1 and a[x][y] == 0: a[x][y]=num y=y+1 num=num+1 x=x+1 y=y-1 for row in a: print(*row)