- Time limit: 1.00 s
- Memory limit: 512 MB
You want to attach a rectangular advertisement to the fence. What is the maximum area of such an advertisement?
Input
The first input line contains an integer $n$: the width of the fence.
After this, there are $n$ integers $k_1,k_2,\ldots,k_n$: the height of each board.
Output
Print one integer: the maximum area of an advertisement.
Constraints
- $1 \le n \le 2 \cdot 10^5$
- $1 \le k_i \le 10^9$
Input:
8
4 1 5 3 3 2 4 1
Output:
10