Define a new operation: a&b=(a+1)/b, find the value of 2&(3&4).
定义新运算：a&b=(a+1)/b，求：2&(3&4)的值为多少．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 4</gadget>
<output>1</output>

<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<result>3</result>