ICPC 2015 · Problem A · Amalgamated Artichokes

Time limit: 5 seconds

Picture by Hans Hillewaert via Wikimedia Commons Fatima Cynara is an analyst at Amalgamated Artichokes (AA). As with any company, AA has had some very good times as well as some bad ones. Fatima does trending analysis of the stock prices for AA, and she wants to deter- mine the largest decline in stock prices over various time spans. For example, if over a span of time the stock prices were $19$, $12$, $13$, $11$, $20$ and $14$, then the largest decline would be $8$ between the first and fourth price. If the last price had been $10$ instead of $14$, then the largest decline would have been $10$ between the last two prices.

Fatima has done some previous analyses and has found that the stock price over any period of time can be mod- elled reasonably accurately with the following equation:

$price(k) =p\cdot (sin(a\cdot k+b) + cos(c\cdot k+d) + 2)$

where $p$, $a$, $b$, $c$ and $d$ are constants. Fatima would like you to write a program to determine the largest price decline over a given sequence of prices. Figure A.1 illustrates the price function for Sample Input 1. You have to consider the prices only for integer values of $k$.

Figure A.1: Sample Input 1. The largest decline occurs from the fourth to the seventh price.

Input

The input consists of a single line containing $6$ integers $p$ ($1 \le p \le 1 000$), $a$, $b$, $c$, $d$ ($0 \le a, b, c, d \le$ $1 000$) and $n$ ($1 \le n \le 10^{6}$). The first $5$ integers are described above. The sequence of stock prices to consider is $price(1),price(2), . . . ,price(n)$.

ACM-ICPC World Finals 2015 Problem A: Amalgamated Artichokes

Output

Display the maximum decline in the stock prices. If there is no decline, display the number $0$. Your output should have an absolute or relative error of at most $10^{- 6}$.

Sample Input 1

42 1 23 4 8 10

Sample Output 1

104.855110477

Sample Input 2

100 7 615 998 801 3

Sample Output 2

0.00

Sample Input 3

100 432 406 867 60 1000

Sample Output 3

399.303813

ACM-ICPC World Finals 2015 Problem A: Amalgamated Artichokes