Integers num$\_$cakes and money$\_$in$\_$bank are read from input. Each cake costs $3$ dollars.

Write the following if$-$else statement. Within the if branch, write the following assignment and nested if$-$else statement:

If num$\_$cakes is greater than or equal to $4$:

Assign variable total$\_$cost with the product of num$\_$cakes and $3.$

If total$\_$cost is less than or equal to money$\_$in$\_$bank, then output 'Approved transaction'.

Otherwise, output 'Not enough money to buy all'.

Otherwise, output 'Not allowed to purchase less than $4$ cakes'