We know: 1 knife can cut a cake into two pieces, 2 knife can cut a cake into four pieces at most, then how many pieces can a cake be cut into at most 8 dollars.
我们知道：1刀可以把一个蛋糕切成两块，2刀最多可以把一个蛋糕切成四块，那么8刀最多可以把一个蛋糕切成多少块．
<gadget id="calculator">10 + 1</gadget>
<output>11</output>

<gadget id="calculator">10 * 11</gadget>
<output>110</output>

<gadget id="calculator">1 + 1</gadget>
<output>2</output>

<gadget id="calculator">110 / 2</gadget>
<output>55</output>

<gadget id="calculator">1 + 55</gadget>
<output>56</output>

<result>56</result>