Problem F: 498' |

Looking throw the Online Judge's Problem Set Archive I found a very interesting problem number 498, titled ``Polly the Polynomial''. Frankly speaking, I did not solve it, but I derived from it this problem.

Everything in this problem is a derivative of something
from 498. In particular, 498 was * "... designed to
help you remember ... basic algebra skills, make the world a
better place, etc., etc.".* This problem is designed to help
you remember basic derivation algebra skills, increase the speed
in which world becomes a better place, etc., etc.

In 498 you had to evaluate the values of polynomial

In this problem you should evaluate its derivative. Remember that derivative is defined as

All the input and output data will fit into integer, i.e. its absolute
value will be less than 2^{31}.

Your program
should accept an even number of lines of text. Each pair of lines
will represent one problem. The first line will contain one integer -
a value for *x*. The second line will contain a list of
integers *a _{0}*,

Input is terminated by <EOF>.

For each pair of lines, your program should evaluate the derivative of
polynomial for the given value *x* and output it in a single line.

7 1 -1 2 1 1 1

```
1
5
```

#### Alexander Denisjuk, 2002