small flags of different colors, any three of them are arranged in a row to represent a signal, how many different signals are there in total?
5面颜色不同的小旗，任取三面排成一列表示一种信号，问共有多少不同的信号．
<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<result>60</result>