There are two empty barrels of 1.7 liters and 4 liters and 100 liters of gasoline in a large barrel. How many times do you need to pour out 1 liter of gasoline with these two empty barrels?
现有1.7升和4升的两个空桶和一个大桶里的100升汽油，用这两个空桶要倒出l升汽油，至少需要倒多少次？
<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>