i am taking C++ in school and i got my first assignment i bought the required text but it will receive at next week but i want to get this assignment over with here the question if anybody can help me out i would appreciate it..thanks in advance here the question

"WRITE A COMPLETE C++ PROGRAM,USING CIN AND COUT << STATEMENTSS,FOR THE FOLLOWING:

A SALES COMPANY NEEDS A PROGRAM THAT ALLOWS THEIR STORE CLERKS TO ENTER NUMBER OF BOXES IN STOCK AT THE BEGINNING OF THE CURRENT MONTH,THE NUMBER OF BOXES PURCHASED DURING THE CURRENT MONTH AND THE NUMBER OF BOXES SOLD DURING THE CURRENT MONTH.THE PROGRAM SHOULD CALCULATE AND DISPLAY THE NUMBER OF BOXES IN STOCK AT THE END OF THE CURRENT MONTH.
ANY HELP WOULD BE APPRECIATED!!