Calculation: 5*8+8*11+11*14+...+23*26=how much.
计算：5*8+8*11+11*14+…+23*26=多少．
<gadget id="calculator">21 * 8 * 11</gadget>
<output>1_848</output>

<gadget id="calculator">1_848 + 70</gadget>
<output>1_918</output>

<result>1_918</result>