The addition formula 1+2, 2+5, 3+8, 1+11, 2+14, 3+17, ... are arranged according to certain rules, so what is the 40th addition formula
加法算式1+2，2+5，3+8，1+11，2+14，3+17，…是按一定的规律排列的，则第40个加法算式是多少
<gadget id="calculator">3 * 40</gadget>
<output>120</output>

<gadget id="calculator">120 - 1</gadget>
<output>119</output>

<gadget id="calculator">1 + 119</gadget>
<output>120</output>

<result>120</result>