時間限制：2000 毫秒記憶體限制：64 MB
Joana loves playing with odd numbers. In the other day, she started writing, in each line, an odd number of odd numbers. It looked as follows:
1
3 5 7
9 11 13 15 17
19 21 23 25 27 29 31
...
On a certain line Joana wrote 55 odd numbers. Can you discover the sum of the last three numbers written in that line? Can you do this more generally for a given quantity of odd numbers?
Given the number N of odd numbers in a certain line, your task is to determine the sum of the last three numbers of that line.
Input
The input is a sequence of lines, one odd number N (1 < N < 1000000000) per line
Output
For each input line write the sum of the last three odd numbers written by Joana in that line with N numbers. This sum is guaranteed to be less than 2^63.
範例輸入 1
3 5 7
範例輸出 1
15 45 87
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