Take 4 random numbers from 1, 2, 3, 4, 5 to form a four-digit number, what is the average of these four-digit numbers?
从数字1，2，3，4，5中任意取4个组成四位数，则这些四位数的平均数是多少．
<gadget id="calculator">1_000 + 100 + 10 + 1</gadget>
<output>1_111</output>

<gadget id="calculator">1 + 2 + 3 + 4 + 5</gadget>
<output>15</output>

<gadget id="calculator">4 * 3 * 2</gadget>
<output>24</output>

<gadget id="calculator">5 * 4 * 3 * 2</gadget>
<output>120</output>

<gadget id="calculator">24 / 120</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1_111 * 15 * (1/5)</gadget>
<output>3_333</output>

<result>3_333</result>