Algebra Express

Input file : stdin Output file: stdout Mim is a high school algebra teacher. Just last week, she taught her students how to evaluate an expression. For example, if r = a × (b + c) − d × e Given the values of a, b, c, d and e, they can evaluate r. Now, to test how well her students are able to do these arithmetic, she has to prepare some test. But, she do this every year, and each time she has