Please I need someone to solve C programming ASAP

Write a C program that prompts for and reads the number of courses a student takes in a semester; it then displays the total charge to be paid. In each semester, a private University charges 2000 Dollars per course for each of the first four courses a student takes. For each course in excess of 4 , the charge is 1500 per course. Your program must display an appropriate error message if the entered number of courses is zero or negative. [ /10] codio@tonight-bogart: /workspace/exam\$ ./q6 Enter number of courses: 3 Total charge =6000 Dollars codio@tonight-bogart: /workspace/exam\$./q6 Enter number of courses: 5 Total charge =9500 Dollars codio@tonight-bogart: /workspace/exam\$./q6 Enter number of courses: -2 Error: Invalid number of courses