The rope is wrapped around the cylinder, and the rope needs to be 3 meters for one circle. After 5 circles, there is still 1 meter left. How many meters is this rope?
绳绕圆柱，一圈需要用绳3米，绕了5圈，还剩1米．这根绳子长多少米？
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 1</gadget>
<output>16</output>

<result>16</result>