Xiao Ming made 6 small planes, and after Xiao Gang gave Xiao Ming 1 plane, Xiao Gang's plane was 4 times that of Xiao Ming's. How many planes did Xiao Gang make?
小明做了6架小飞机，小刚做的飞机给小明1架后，小刚的飞机就是小明的4倍，小刚做了多少架飞机？
<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 4</gadget>
<output>28</output>

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

<result>29</result>