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Buy and Sell Once

Goal

Given is the price-development of an arbitrary stock.

stock-price over time

Suppose you have perfect knowledge and are able to buy and sell the stock once. Write an algorithm that outputs the maximum profit that can be made.

  • The price-development is given for an arbitrary number of days.
  • A stock can only be sold on the next day.
  • Stock-prices are given as integers

Input

A blank-separated array of stock-prices.

Each position symbolises the stock-price of a given day.

Output

The maximum profit that can be made within that day.

Constraints

  • 2 <= days with stock-prices <= 50
  • 1 <= stock-price <= 2,147,483,647

Example

Input: 310 315 275 295 260 270 290 230 255 250

Output: 30