Perfect Pairing

You have a list of integers representing a collection of items with specific values. Your goal is to find pairs of these items that add up to a specified target sum. Print the total number of unique pairs found. Each pair (i, j) is considered the same as (j, i). Input Format: - First line contains space-separated integers representing the item values. - Second line contains a single integer target representing the sum. Output Format: - A single integer representing the total number of unique pairs that add up to the target sum. Example: Input: 1 2 3 4 5 5 Output: 2