"IMO" is the abbreviation of International Mathematical Olympiad. If these 3 letters are written in 3 different colors, there are 5 different colors of pens. How many different writing methods are there?
"IMO"是国际数学奥林匹克的缩写，把这3个字母用3种不同颜色来写，现有5种不同颜色的笔，共有多少种不同的写法．
<gadget id="calculator">5 * 4 * 3</gadget>
<output>60</output>

<result>60</result>