Question: adding elements from different lists

so if i want to perform a function on elements from a list i do 


X:=[3, 5, 6, 7]


add(x*ln(x), x = X)



but what if i want to have two lists X and Y and perform the function xi*ln(yi) and add that up?



PS: keep in mind that im working with integers aswell as floats


thanks :)

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