18 tons of stones were shipped to the construction site, half of which was used on the first day, more than one ton, and the remaining half was used on the second day, how many tons are left?
工地上运来了18吨石子，第一天用了一半多一吨，第二天用了剩下的一半后，还剩多少吨？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">18 * (1/2)</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<gadget id="calculator">8 * (1/2)</gadget>
<output>4</output>

<gadget id="calculator">18 - 10 - 4</gadget>
<output>4</output>

<result>4</result>