What is the calculation result of the formula 3+5+7+9+...+73+75?
算式3+5+7+9+…+73+75的计算结果是多少．
<gadget id="calculator">78 * 18</gadget>
<output>1_404</output>

<gadget id="calculator">1_404 + 39</gadget>
<output>1_443</output>

<result>1_443</result>