The MAX

Time Limit: 4000/2000 MS (Java/Others)

Memory Limit: 32768/32768 K (Java/Others)

Description

Giving N integers, V1, V2,,,,Vn, you should find the biggest value of F.

Input

Each test case contains a single integer N (1<=N<=100). The next line contains N integers, meaning the value of V1, V2....Vn.(1<= Vi <=10^8).The input is terminated by a set starting with N = 0. This set should not be processed.

Output

For each test case, output the biggest value of F you can find on a line.

Sample Input

2 1 2 0

Sample Output

4017

Hint

lcy

Source

HDU 2009-4 Programming Contest

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