n = int(input())
ans = [[0]*n for i in range(n)]
i, j, di, dj = 0, 0, 0, 1
for k in range(n**2):
    ans[i][j] = str(k+1).zfill(3)
    if ans[(i+di)%n][(j+dj)%n]:
        di, dj = dj, -di
    i += di
    j += dj
for i in range(len(ans)):
    print(*ans[i])