N = int(input())
dr = [0, 1, 0, -1]
dc = [1, 0, -1, 0]
r = 0
c = 0
d = 0
i = 1
grid = [[-1] * N for i in range(N)]
while i <= N * N:
    grid[r][c] = i
    i += 1
    nr = r + dr[d]
    nc = c + dc[d]
    if 0 <= nr < N and 0 <= nc < N and grid[nr][nc] == -1:
        r = nr
        c = nc
    else:
        d = (d + 1) % 4
        r = r + dr[d]
        c = c + dc[d]

def pr(x):
    if x < 10:
        print("00" + str(x), end = " ")
    elif x < 100:
        print("0" + str(x), end = " ")
for i in range(N):
    for j in range(N):
        pr(grid[i][j])
    print("")