Aunt Zhang's snack department has made a new kind of delicious steamed buns. At breakfast, Xiaohong's mother bought some for everyone to taste. Dad ate half of the whole buns, mother ate the remaining half, and Xiaohong ate the last half, so the buns were all eaten. How many buns did Xiaohong's mother buy?
张大妈的小吃部新做了一种很好吃的小馒头．早餐时，小红的妈妈买来一些给大家品尝．爸爸吃了全部的一半多1个，妈妈吃了剩余的一半多1个，小红吃了最后剩余的一半多1个，这样小馒头刚好全部吃完．小红的妈妈买来多少个小馒头？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

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

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

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>