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:
Dave had to wash 9 short sleeve shirts and 27 long sleeve shirts before school . If he had only washed 20 of them by the time school started , how many did he not wash ?

Ex Output:
16


Ex Input:
Ella owns 2 dogs . Each day , 1 dog eats 0.125 scoop of dog food and the other dog eats 0.125 scoop . Together , how much dog food do the 2 dogs eat each day ?

Ex Output:
0.25


Ex Input:
Ned was helping the cafeteria workers pick up lunch trays , but he could only carry 5 trays at a time . If he had to pick up 5 trays from one table and 5 trays from another , how many trips will he make ?

Ex Output:

2