In a pile of cement pipes, there are 4 pipes on the first floor, 10 pipes on the bottom floor, and one more pipe for each lower floor. How many pipes are there in total in this pile?
一堆水泥管，第一层是4根，最底一层是10根，每往下一层，水泥管就多一根，问这堆水泥管共有多少根？
<gadget id="calculator">4 + 10</gadget>
<output>14</output>

<gadget id="calculator">10 - 4</gadget>
<output>6</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">14 * (7/2)</gadget>
<output>49</output>

<result>49</result>