There are 35 bags of sugar, 34 bags of sugar are qualified, and only one bag is unqualified, which is lighter. Use a balance to weigh, at least how many times you can find the bag of sugar.
35袋糖，有34袋糖合格，只有一袋不合格，轻一些．用天平去称，至少称多少次才能找出这袋糖．
<gadget id="calculator">1 + 1 + 1 + 1</gadget>
<output>4</output>

<result>4</result>