n = int(raw_input())
l = [[0 for _ in range(n)] for _ in range(n)]
c = 1
for i in range((n+1)/2):
    for x in range(i, n-i):
        l[i][x] = c
        c += 1
    for y in range(i+1, n-i):
        l[y][n-i-1] = c
        c += 1
    for x in range(n-i-2, i-1, -1):
        l[n-i-1][x] = c
        c += 1
    for y in range(n-i-2, i, -1):
        l[y][i] = c
        c += 1
for ll in l:
    ls = [str(i).zfill(3) for i in ll]
    print ' '.join(ls)