Leo and Mia are playing a game. Here are the rules：  1. There are $$14$$ apples placed in a row.  2. The players take turns removing either $1$ or $2$ apples each turn.  3. Whoever picks the last apple wins the game.  Leo starts first and is followed by Mia. To ensure his victory, how many apples must Leo take away in the first turn? 
Overseas Competition->Knowledge Point->Combinatorics->Strategies and Operations->Game Strategy