A certain kind of ice cream is 8 yuan each. This kind of ice cream has recently launched a "buy three get one free" promotion. Each of the 12 students in the mathematics interest group eats one. How much do they need to spend at least?
某种冰激凌每个8元，这种冰激凌最近推出了"买三送一"的优惠活动，数学兴趣小组12位同学每人吃一个，他们至少需要花多少元钱．
<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 8</gadget>
<output>72</output>

<result>72</result>