i really need help writting this code

The factorial of a nonnegative integer n is written n! ( pronounced "n factorial") and is defined as follows: n!= n x (n-1) x (n-2) x.....x 1 ( for values of n greater than or equal to 1) and n!=1 ( for n=0). for example 5!= 5*4*3*2*1 which is 120....... computes and prints its factorial if the number is larger than 8..... computes and prints the square of the factorial value for the input number if the input number is smaller or equal to 8. for example if you input 5, the output should be 120*120= 14400.....