Coins

Given an infinite number of quarters (25¢), dimes (10¢), nickels (5¢), and pennies (1¢), write code to calculate the number of ways to represent n cents.

Examples:

represent(10) → 4
  (10, 5+5, 5+1+1+1+1+1, 1+1+...+1)

represent(0)  → 1  (one way: use no coins)