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

[EX Q]: Sam found 35 seashells on the beach , he gave Joan 18 of the seashells . How many seashells does he now have ?
[EX A]: 17

[EX Q]: Tim had 50 cents . He paid 45 cents for a candy bar . How much change will he get ?
[EX A]: 5

[EX Q]: Todd has some gum . Steve gave him 16 more pieces of gum . Now Todd has 54 pieces of gum . How many pieces did Todd have to start with ?
[EX A]:
38