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.

Input: Consider Input: Sara has 3 green and 5 red marbles . Tom has 4 green marbles . How many green marbles do they have in total ?

Output: 7

Input: Consider Input: If 0.5 of 8 pets are cats . How many are cats ?

Output: 4

Input: Consider Input: There were 28 girls and 35 boys on the playground at recess . How many children were there in all ?
Output: 63