Problem
Given an array and X, count the number of unordered pairs (i < j) whose sum is X.
Input format
Input
input.txt
- The first line contains N (1 ≤ N ≤ 100). - The second line contains N integers. - The third line contains X.
Output format
Output
output.txt
- The number of pairs.
Example
input
5 1 5 7 -1 5 6
output
3
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Sample cases (from the problem)
Sample Case 1
Input
5 1 5 7 -1 5 6
Expected output
3
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