Permutation Counting

Problem Number: 
1 485
Type of Problem: 
Single Output Problem
Problem Category: 
Volume 14 (1,400-1,499)
Input: 
Random Input
0
0
Critical Input: 
Random Input: 
3 0 3 1
Problem Description Link: 
https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=1…
Problem Id: 
1485