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.

Context: Mary is baking a cake. The recipe calls for 10 cups of flour 2 cups of sugar and 80 cups of salt. She already put in 7 cups of flour. 

 Question: How many more cups of flour than cups of sugar does she need to add now?
1