5446: Maximum Value
内存限制：256 MB
时间限制：2 S
题面：传统
评测方式：文本比较
上传者：
提交：1
通过：1
题目描述
B. Maximum Value
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
You are given a sequence a consisting of n integers. Find the maximum possible value of 
(integer remainder of ai divided by aj), where 1≤i,j≤n and ai≥aj.
(integer remainder of ai divided by aj), where 1≤i,j≤n and ai≥aj.
Input
The first line contains integer n− the length of the sequence (1≤n≤2·105). The second line contains n space-separated integers ai (1≤ai≤106).
Output
Print the answer to the problem.
Examples
Input
3 3 4 5
Output
2
输入样例 复制
输出样例 复制