def reverse_rows(n):
    for i in range(n // 2):
        for j in range(n):
            yield (i, j), (n - 1 - i, j)


def print_matrix(m):
    for row in m:
        print(row)


def apply_swaps(matrix, swaps) -> None:
    for (i1, j1), (i2, j2) in swaps:
        matrix[i1][j1], matrix[i2][j2] = matrix[i2][j2], matrix[i1][j1]


def test_works():
    A = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
    print_matrix(A)
    print()
    apply_swaps(A, reverse_rows(3))
    print_matrix(A)


def main():
    n = int(input('n: '))
    for t1, t2 in reverse_rows(n):
        print(*t1, *t2)


main()