Problem Statement

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

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

Output Format

Output the total number of plausible sextuples.

Sample Input and Output

Sample Input #1

1
1

Sample Output #1

1

Sample Input #2

2
2
3

Sample Output #2

4

Sample Input #3

2
-1
1

Sample Output #3

24

Sample Input #4

3
5
7
10

Sample Output #4

10

见题面 Input 部分

见题面 Output 部分