Xiao Ming, Xiao Lin, Xiao Fang, Xiao Bing and Xiao Qiang are playing a chess game, and each of them has to play a game. How many games do they have to play in total?
小明、小林、小芳、小兵和小强5人进行象棋比赛，每两人间都要下一盘，他们一共要下多少盘棋？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">4 * (5/2)</gadget>
<output>10</output>

<result>10</result>