Write definitions for the following two functions:

sumN $(n)$ returns the sum of the first $n$ natural numbers.

sumNCubes $(n)$ returns the sum of the cubes of the first $n$ natural numbers.

Then use these functions in a program that prompts a user for an $n$ and prints out the sum of the first $n$ natural numbers and the sum of the cubes of the first $n$ natural numbers.