Multiplication Puzzle

Time Limit: 2 Seconds
Memory Limit: 65536 KB

The multiplication puzzle is played with a row of cards, each containing a
single positive integer. During the move player takes one card out of the row
and scores the number of points equal to the product of the number on the card
taken and the numbers on the cards on the left and on the right of it. It is
not allowed to take out the first and the last card in the row. After the final
move, only two cards are left in the row.

The goal is to take cards in such order as to minimize the total number of scored
points.

For example, if cards in the row contain numbers 10 1 50 20 5, player might
take a card with 1, then 20 and 50, scoring

10*1*50 + 50*20*5 + 10*50*5 = 500+5000+2500 = 8000

If he would take the cards in the opposite order, i.e. 50, then 20, then 1,
the score would be

1*50*20 + 1*20*5 + 10*1*5 = 1000+100+50 = 1150.

**Input**

The first line of the input file contains the number of cards N (3 <= N <=
100). The second line contains N integers in the range from 1 to 100, separated
by spaces.

Process to the end of file.

**Output**

Output file must contain a single integer - the minimal score.

Sample Input

6

10 1 50 50 20 5

**Sample Output**

3650

Source:

**Northeastern Europe 2001, Far-Eastern Subregion**
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