There are 5 red socks and 4 white socks in the box, at least how many socks Xiao Fang has to find out to ensure that there are two socks of different colors.
盒子里有5只红袜子和4只白袜子，小方至少要摸出多少只袜子，才能保证有两只颜色不同的袜子．
<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>