题目描述

小青遇到了这样一个问题：On every June 1st, the Children's Day, there will be a mass celebration in the Zhejiang University. As a flying plan, some balloons will be released into the campus.

输入格式

The input consists of multiple test cases. The first line of each test case contains an integer N (1 <= N <= 100). Then N numbers follow.

输出格式

For each test case, output the maximum product in a line.

样例

样例 1

输入 # 1

5 1 2 3 4 5

输出 # 1

120