Bloques

Little Joan has N blocks,all of them of different sizes. He is playing to build cities in the beach. A city is just a collection of buildings. A single block over the sand can be considered as a building. Then he can construct higher buildings by putting a block above any other block. At most one block can be put immediately above any other block. However he can stack several blocks together to construct a building. However, its not allowed to put bigger blocks on top of smaller ones, since the stack of blocks may fall. A block can be specified by a natural number that represents its size. It doesnâ€™t matter the order among buildings. That is: 13 24 is the same configuration as: 31 42 Your problem is to compute the number of possible different cities using N blocks. We say that #(N) gives the number of different cities of size N. If N = 2, for instance, there are only two possible cities: City #1: 12 In this city both blocks of size 1 and 2 are put over the sand. City #2: 1 2 In this city block of size 1 is over block is size 2, and block of size 2 is over the sand. So, #(2) = 2. Input A sequence of non-negative integer numbers, each of one in different line. All of them but the last one are natural numbers. The last one is 0 and means the end. Each natural number is less than 900. Output For each natural number I in the input, you must write a line with the pair of numbers I, #(I). Sample Input 2 3 0

2/2 Sample Output 2, 2 3, 5