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