The four monks, master and apprentice, are standing for a photo. If the monk Tang has been standing on the far left, the others can change positions at will. How many ways are there in total?
唐僧师徒4人站着照相，如果唐僧一直站在最左边，其他人可以任意换位置，一共有多少种站法．
<gadget id="calculator">3 * 2 * 1</gadget>
<output>6</output>

<result>6</result>