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字串数

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 7648    Accepted Submission(s): 2125


Problem Description
一个A和两个B一共可以组成三种字符串:"ABB","BAB","BBA".
给定若干字母和它们相应的个数,计算一共可以组成多少个不同的字符串.
 

Input
每组测试数据分两行,第一行为n(1<=n<=26),表示不同字母的个数,第二行为n个数A1,A2,...,An(1<=Ai<=12),表示每种字母的个数.测试数据以n=0为结束.
 

Output
对于每一组测试数据,输出一个m,表示一共有多少种字符串.
 

Sample Input
2
1 2
3
2 2 2
0
 

Sample Output
3
90
 

Source
浙江工业大学第四届大学生程序设计竞赛
 

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