Xiaohua and Xiaofang are playing a game of fetching matches. There are 15 matches in total. The game stipulates that two people take turns to take away the matches. They can only take 1 or 2 matches each time. Whoever gets the last match wins. How should Xiaohua get matches to ensure that he can win?
小华和小芳玩取火柴游戏．共15根火柴，游戏规定，两人轮流取走火柴，每次只能取1根或2根，谁取到最后一根火柴，谁就赢．小华应该怎样取火柴才能保证自己能赢？
<gadget id="calculator">15 - 3 - 3 - 3 - 3</gadget>
<output>3</output>

<result>3</result>