The three sides of a triangle are all integers in centimeters, and two of them are 7 centimeters and 12 centimeters, so what is the largest possible centimeter of the third side?
一个三角形三条边都是整厘米数，其中两条边分别是7厘米和12厘米，那么第三条最大可能是多少厘米．
<gadget id="calculator">7 + 12</gadget>
<output>19</output>

<gadget id="calculator">19 - 1</gadget>
<output>18</output>

<result>18</result>