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.

Example 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 ?
Example Output: 16

Example Input: Tom had 27 pennies and 15 dimes in his bank . His dad gave him 33 dimes and 49 nickels . How many dimes does he have now ?
Example Output: 48

Example Input: A waiter had 14 customers to wait on . If 3 customers left and he got another 39 customers , how many customers would he have ?
Example Output:
50