Kelly and Dan are playing a game. Here are the rules：  1. There are $$11$$ matches placed in a row.  2. The players take turns removing either $1$ or $2$ matches each turn.  3. Whoever picks the last match wins the game.  Kelly starts first and is followed by Dan. To ensure her victory, how many matches must Kelly take away in the first turn? 
Overseas Competition->Knowledge Point->Combinatorics->Strategies and Operations->Game Strategy