How many three-digit numbers can be formed using the five numbers 1, 2, 3, 4, and 5? (The numbers on each bit are allowed to be the same).
用1，2，3，4，5五个数字可以组成多少个三位数．(各位上的数字允许相同)．
<gadget id="calculator">5 * 5 * 5</gadget>
<output>125</output>

<result>125</result>