There is a jacket that is 50 cm long. One button is sewn every 10 cm, one at the collar and one at the bottom. How many buttons are sewn on this dress?
有一件上衣50厘米，每10厘米缝一个纽扣，衣领处和最下边各缝一个，这件衣服上缝多少个纽扣．
<gadget id="calculator">50 / 10</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>