There are four bags of sugar, and the number of pieces in each bag is different. The total number of pieces in any three bags of sugar is not less than 60 pieces. Then, the sum of the number of pieces in these four bags of sugar is at least how many pieces.
有四袋糖，每袋糖的块数都不相同，任意三袋糖的块数总和都不少于60块，那么，这四袋糖的块数总和至少有多少块．
<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<gadget id="calculator">19 + 20 + 21 + 22</gadget>
<output>82</output>

<result>82</result>