Xiao Li, Xiao Wang, Xiao Zhang, and Xiao Zhao each have a number of colored balls. How many colored balls are there in total?
小李、小王、小张、小赵各有彩球若干个，小李、小王共有34个，小王、小张共有36个，小张、小赵共有40个，小李、小赵共有彩球多少个？
<gadget id="calculator">34 - 36</gadget>
<output>-2</output>

<gadget id="calculator">(-2) + 40</gadget>
<output>38</output>

<result>38</result>