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Problem
Given an array and a number X, determine if there exist two distinct elements in the array whose sum is X. Print "YES" or "NO".
Input format
Input
input.txt
- The first line contains N (1 ≤ N ≤ 100). - The second line contains N integers (-1000 ≤ Ai ≤ 1000). - The third line contains X.
Output format
Output
output.txt
- "YES" if such a pair exists, "NO" otherwise.
Example
input
4 1 2 3 4 6
output
YES
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Sample cases (from the problem)
Sample Case 1
Input
4 1 2 3 4 6
Expected output
YES
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