Given the following code and input, what is the final output printed?

Given the following code and input, what is the final output printed?

def maximumUnits(boxTypes, truckSize):
    boxTypes.sort(key=lambda x: x[1], reverse=True)
    totalUnits = 0
    for boxes, units in boxTypes:
        if truckSize == 0:
            break
        take = min(boxes, truckSize)
        totalUnits += take * units
        truckSize -= take
    return totalUnits

boxTypes = [[1,3],[2,2],[3,1]]
truckSize = 4
print(maximumUnits(boxTypes, truckSize))