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: Jessica is baking a cake . The recipe calls for 8 cups of flour and 2 cups of sugar . She already put in 4 cups of flour . How many cups of flour does she need to add ?
Example Output: 4

Example Input: Carol and her mom were picking carrots from their garden . Carol picked 29 and her mother picked 16 . If only 38 of the carrots were good , how many bad carrots did they have ?
Example Output: 7

Example Input: Carlos has 58 blocks . He gives 21 to Rachel . How many blocks will Carlos have ?
Example Output:
37