There are three non-uniform empty barrels with volumes of 160 liters, 119 liters, and 77 liters without scales, and an infinite amount of water. How many operations must be performed to measure out 76 liters of water? (Receiving water, pouring each other, and pouring water are all counted as one operation)
有三个没有刻度，容积分别为160升、119升和77升的不均匀的空桶，和无限多的水，要想量出76升水，至少需要进行多少次操作．(接水、互倒、倒水均算一次操作)
<gadget id="calculator">1 + 3 + 4</gadget>
<output>8</output>

<result>8</result>