If m and n are the natural Numbers, m can be said for not more than the sum of n number of the cast, f (m, n) for the number of this representation, such as: f (5, 3)=5, 5 kinds of representations: 3 + 2 + 1 + 1, 2, 3 + 2 + 1 + 1 + 1 + 1, 2, 1 + 1 + 1 + 1 + 1, write a recursive method, Ask for help
