cube wooden block is placed on the table, each side has a number, the sum of the two numbers on the opposite side is equal to 13, Xiao Zhang can see the top and two sides, and the sum of the three numbers he sees is 18; Xiao Li The top surface and the other two sides can be seen, and the sum of the three numbers seen is 24. What is the number on the side next to the table?
一个正方体木块放在桌子上，每一面都有一个数，位于对面两个数的和都等于13，小张能看到顶面和两个侧面，看到的三个数和为18；小李能看到顶面和另外两个侧面，看到的三个数的和为24，那么贴着桌子的这一面的数是多少？
<gadget id="calculator">18 + 24</gadget>
<output>42</output>

<gadget id="calculator">13 + 13</gadget>
<output>26</output>

<gadget id="calculator">42 - 26</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">13 - 8</gadget>
<output>5</output>

<result>5</result>