Beibei, Jingjing, Huanhuan, Yingying, and Nini are 10 kinds of Fuwa. At least how many Fuwa do you buy to ensure that there will be two of the same Fuwa?
贝贝、晶晶、欢欢、迎迎、妮妮五种福娃个10个，至少买多少个福娃才可以保证一定有两个一样的福娃？
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>