Time Limit: 1 sec
Make a simple program that reads four variables named A, B, C, D. Calculate and print the difference between multiplication of A, B and multiplicaiton of C, D (A * B - C * D).
The input file contains 4 integer numbers A, B, C, and D (A<1000, B<1000, C<1000 and D<1000).
Output will show the difference of A * B and C * D in a separate line.
10 4 5 2
Problem Setter: Shahin ShamS