If the two sides of a triangle are 5 cm and 8 cm respectively, what is the shortest centimeter of the third side (must be an integer).
如果三角形的两条边分别是5厘米和8厘米，那么第三条边(必须是整数)最短是多少厘米．
<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<result>4</result>