Pratham and Akansha are playing a game with some stones. In a single turn, they are allowed to take away only 1, 2, 3, 4 or 5 stones. They cannot pass any turn. The game continues till all the
stones are taken away. The player taking away the last stone(s), leaving nothing behind, wins. After some moves, it was Pratham's turn to take away stones. But he found that he could not win whatever number of stones he took away in that turn. Which of these could be the number of
stones remaining when his turn came?