n = int(input())
dx = [0, 1, 0, -1]
dy = [1, 0, -1, 0]

x, y, d = 0, 0, 0

tbl = [[0] * n for _ in range(n)]

for i in range(n * n):
    tbl[x][y] = str(i+1).zfill(3)
    r, c = x + dx[d], y + dy[d]
    if r < 0 or r >= n or c < 0 or c >= n or tbl[r][c] != 0:
        d = (d + 1) % 4
    x, y = x + dx[d], y + dy[d]
    
for i in tbl:
    print(*i)