排列组合+高精度

　　Orz PoPoQQQ

引用题解：

嗯……学习了一下python= =懒的写高精了

 1 /**************************************************************
 2     Problem: 2729
 3     User: Tunix
 4     Language: Python
 5     Result: Accepted
 6     Time:832 ms
 7     Memory:6360 kb
 8 ****************************************************************/
 9
10 def A(n):
11     re=1
12     for i in range(1,n+1):
13         re*=i
14     return re
15 def C(n,m):
16     if n<m:
17         return ;
18     return A(n)//A(m)//A(n-m)
19 n,m=[int(i) for i in raw_input().split()]
20 print m*A(n+1)*2*A(m-1)*C(n+2,m-1)+(A(n+2)-A(n+1)*2)*A(m)*C(n+3,m)