PLEASE CODE USING LISP PROGRAMMING LANGUAGE.

defined as fb ( 0 )=0, fib(1)-1 and fib(n)=fib(n-1)+fib(n-2) for n > 1. examples: n= fib(n) = 0112358132134 0 1 2 3 4 5 6 78 9. .. 8. Write a function, named great, that takes 3 numbers and returns the greater of the three. 9. Write a function, named sum, that takes an integer n and returns the summation of n and all positive integers preceding it; e.g., passing 4 will return 10, which is 1+2+3+4