Study the program carefully to understand the concepts related to I$/$O$,$ branching, and looping. The program calculates the results from $1+2+3+...+$n where n is the user input. You will modify the program to add a validity check for n$.$ If n is less than or equal to $0,$ your program will not calculate the result, rather will branch to a label exit$\_$error where an error message $$The value of n must be greater than or equal to $1$ will be printed.

Hints: You may need to use a pseudocode for checking the value of n$.$

Whenever you type an instruction or move the cursor over it$,$ MARS shows very helpful description of the format and example of the instructions. Use it extensively. MARS help menu is also very resourceful. Practice using these.