A batch of steel pipes are stacked in a pile, there are 10 steel pipes in the bottom layer, 1 steel pipe is placed in each upper layer, and 5 steel pipes are placed in the upper layer. How many steel pipes are there in this batch?
一批钢管叠成一堆，最下层有10根，每上1层少放1根，最上1层放了5根．这批钢管有多少根？
<gadget id="calculator">5 + 10</gadget>
<output>15</output>

<gadget id="calculator">10 - 5</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<result>45</result>