Definition: You are given a math word problem and you are supposed to only use subtraction on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
Input: Context: Mary is baking a cake. The recipe calls for 12 cups of flour and 13 cups of sugar. She already put in 2 cups of sugar. 

 Question: How many more cups of sugar does she need to add?

11