You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication, or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

alvin had 57 marbles and played 2 games . he lost 18 marbles during the first game . he won 25 marbles during the second game . how many marbles did alvin have then ?
64