Factorial Sum
Adapted by Neilor Tonin, URI 
Brazil
Adapted by Neilor Tonin, URI Brazil
Read two numbers M and N indefinitely. Calculate and write the sum of their factorial. Be carefull, because the result can have more than 15 digits.
The input file contains many test cases. Each test case contains two integer numbers M (0 ≤ M ≤ 20) and N (0 ≤ N ≤ 20). The end of file is determined by eof.
For each test case in the input your program must print a single line, containing a number that is the sum of the both factorial (M and N).
| Input Sample | Output Sample |
|
4 4 |
48 |