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Buy And Sell Stocks - One Transaction Allowed

1. You are given a number n, representing the number of days. 2. You are given n numbers, where ith number represents price of stock on ith day. 3. You are required to print the maximum profit you can make if you are allowed a single transaction.

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Buy And Sell Stocks - One Transaction Allowed

easy

1. You are given a number n, representing the number of days. 2. You are given n numbers, where ith number represents price of stock on ith day. 3. You are required to print the maximum profit you can make if you are allowed a single transaction.

Constraints

0 <= n <= 20 0 <= n1, n2, .. <= 10

Format

Input

A number n .. n more elements

Output

A number representing the maximum profit you can make if you are allowed a single transaction.

Example

Sample Input

9 11 6 7 19 4 1 6 18 4

Sample Output

17

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