On National Day, lanterns are hung at the gate of the school, every 1 meter, and the length is 5 meters. If each lantern costs 5 yuan, how much is the total cost of buying these lanterns?
国庆节在校门口挂彩灯，每隔1米挂一盏，挂了5米长，如果每盏彩灯要5元，买这些彩灯共需多少元．
<gadget id="calculator">5 / 1</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<result>30</result>