ABCDEF - ABCDEF


You are given a set S of integers between -30000 and 30000 (inclusive).

Find the total number of sextuples  that satisfy: 

 

Input

The first line contains integer N (1 ≤ N ≤ 100), the size of a set S.

Elements of S are given in the next N lines, one integer per line. Given numbers will be distinct.

Output

Output the total number of plausible sextuples.

Examples

Input:
1
1

Output:
1
Input:
2
2
3

Output:
4
Input:
2
-1
1

Output:
24
Input:
3
5
7
10

Output:
10



hide comments
nilabja16180: 2017-03-03 10:00:47

1.85 sec, still it passes!

vladimira: 2017-02-28 02:20:46

Some hate comments bcs of TLEs =)) But I think its a good problem for two reasons: 1 - simple arithmetic formula gives so many ways of making an algorithm 2 - makes you understand how to code same thing in fastest way

cake_is_a_lie: 2017-02-15 03:14:05

So many chances to get bugs on this one SIGFPE > SIGSEGV > WAs (curse you operator %; why don't you learn some math?!), but finally AC in 0.36s; no binary search just iterating over a, b, d and some lookup tables.

I think this one's pretty fun, since there are several viable ways to solve it and it isn't directly obvious which is better.

holmesherlock: 2017-02-02 21:32:04

"d!=0" gave me too many WA

kapillamba4: 2017-01-29 15:14:09

is it even possible to solve this problem in around 0.04 seconds ? how are the top guys able to do it, seems impossible to me :|
took me 1.02 seconds using unordered maps and 1.07 seconds using vectors.

Last edit: 2017-01-29 17:09:42
jatin9533: 2017-01-21 17:38:05

can anyone please explain the first two test cases i.e. for n=1 & n=2

vunnamtej: 2017-01-12 10:32:05

1.25s with bounds and 1.51s with binary search modified

n963: 2016-12-29 14:52:47

AC!!

Last edit: 2017-01-05 05:28:28
Aditya krishna namdeo: 2016-12-15 20:32:52

d!=0 :)

sas1905: 2016-11-15 16:19:23

AC in first go..:)


Added by:Luka Kalinovcic
Date:2009-07-13
Time limit:1s
Source limit:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Languages:All except: ERL JS-RHINO NODEJS PERL6 VB.NET
Resource:own problem