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.

Each year , salmon travel upstream , going from the ocean to the rivers where they were born . This year , 712261 male and 259378 female salmon returned to their rivers . How many salmon made the trip ?
971639

Alyssa picked 25 limes and Mike picked 32 limes . Tom picked 12 plums . How many limes were picked in all ?
57

Isabel bought 900 pieces of paper . She used 156 pieces of the paper . How many pieces of paper does she have left ?

744