When Uncle Wang sells watermelons, he sells half of the watermelons on the first day and one more, and on the second day he sells the remaining half and three more, which happens to be all sold out. How many watermelons are there in total?
王大伯卖西瓜，第一天卖了全部的一半还多1个，第二天卖出剩下的一半还多3个，正好全部卖完．一共有多少个西瓜？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 / (1/2)</gadget>
<output>6</output>

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

<gadget id="calculator">7 / (1/2)</gadget>
<output>14</output>

<result>14</result>