Mom bought a bag of candy for Xiaohua, and Xiaohua decided to share the candy with everyone. The first one saw his younger sister, so he gave half of the candy to his younger sister; the second one saw his older brother, and gave half of the remaining candy to his older brother, at this time he had 4 pieces of candy left. Excuse me, how many pieces of sugar did my mother give Xiaohua in this bag?
妈妈给小华买了一袋糖，小华决定把糖分给大家吃．第一个看见了妹妹，就把糖的一半分给了妹妹；第二个看见了哥哥，又把剩下的糖的一半分给了哥哥，这时他自己还剩4块糖．请问，妈妈给小华的这袋糖共有多少块？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / (1/2) / (1/2)</gadget>
<output>16</output>

<result>16</result>