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: Lana picked 36 tulips and 37 roses to make flower bouquets . If she only used 70 of the flowers though , how many extra flowers did Lana pick ?
Example Output: 3

Example Input: For a birthday party Jerry bought 41 regular sodas and 22 diet sodas . If his fridge would only hold 9 on each shelf , how many shelves would he fill up ?
Example Output: 7

Example Input: While playing at the arcade , Edward won 3 tickets playing ' whack a mole ' and 5 tickets playing ' skee ball ' . If he was trying to buy candy that cost 4 tickets a piece , how many could he buy ?
Example Output:
2