On Xiaoyu's birthday, his mother gave Xiaoyu a box of ballpoint pens. He found his good friends Xiaogang and Xiaoqiang. He gave half of the box of ballpoint pens to Xiaogang, and then added another one to Xiaogang. Then, he distributed the remaining half to Xiaoqiang, and also added another one to Xiaoqiang, and finally left 5 ballpoint pens, which he kept for himself. How many ballpoint pens are there in this box?
小宇过生日时，妈妈送给小宇一盒圆珠笔，他把好朋友小刚和小强找来，他把这盒圆珠笔的一半给了小刚，然后又给小刚加了1支．接着，他又把剩下的一半分给了小强，也同样给小强又加了1支，最后剩下5支圆珠笔，他自己留下了．这盒圆珠笔共有多少支．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>