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

Ex Input:
A florist had 50 roses . If she sold 15 of them and then later picked 21 more , how many roses would she have ?

Ex Output:
56


Ex Input:
Fred has 5 yellow balloons , Sam has 6 yellow balloons , and Mary has 7 yellow balloons . The balloons cost 5 dollars . How many yellow balloons do they have in total ?

Ex Output:
18


Ex Input:
Dan had 7 potatoes and 4 cantelopes in the garden . The rabbits ate 4 of the potatoes . How many potatoes does Dan now have ?

Ex Output:

3