The students lined up to do exercises, counting from the front and the left, Xiaohong is the 5th, and counting from the back and the right, Xiaohong is the 4th. Do you know how many people do the exercises?
同学们排成一方阵做操，从前和左数，小红都是第5个，从后和右数，小红都是第4个．你知道做操的一共有多少人吗？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 - 1 - 1</gadget>
<output>3</output>

<gadget id="calculator">4 + 3 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<result>64</result>