If a bag of candy is distributed to 4 classmates and 7 classmates are left with 1 yuan, what is the minimum number of pieces of this bag of candy?
把一包糖分给4个同学和7个同学都剩下1块，这包糖至少有多少块．
<gadget id="calculator">2 * 2 * 7</gadget>
<output>28</output>

<gadget id="calculator">28 + 1</gadget>
<output>29</output>

<result>29</result>