输入描述:

The input consists of several test cases and is terminated by end-of-file.
The first line of each test case contains an integer n.
The second line contains n integers a1, a2, ..., an.

输出描述:

For each test case, print an integer which denotes the result.

备注:

* 1 ≤ n ≤ 1000
* 1 ≤ ai ≤ 109
* The number of test cases does not exceed 10.