45 model workers shook hands with each other at the "May 1st" Labor Day conference. How many times did they shake hands?
庆祝"五一"劳动节大会上45位劳模互相握手，共握了多少次．
<gadget id="calculator">45 - 1</gadget>
<output>44</output>

<gadget id="calculator">45 / 2</gadget>
<output>45/2 = around 22.5</output>

<gadget id="calculator">44 * (45/2)</gadget>
<output>990</output>

<result>990</result>