There are 10 red socks, 8 blue socks, 6 green socks and 4 white socks in a bag. You can touch the socks from the bag with your eyes closed. You can only touch one at a time. At least one pair of these socks is the same color?
一个袋子中有10只红袜子、8只蓝袜子、6只绿袜子和4只白袜子，闭着眼睛从袋子中摸袜子，每次只许摸一只，至少要摸多少只才能保证摸出的这几只袜子中至少有一双颜色一样？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>