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#include <iostream>
#include <vector>
using namespace std;

bool findPairWithSum(const vector<int>& arr, int x) {
    int left = 0, right = arr.size() - 1;

    while (left < right) {
        int sum = arr[left] + arr[right];
        if (sum == x) {
            return true;
        } else if (sum < x) {
            left++;
        } else {
            right--;
        }
    }

    return false;
}

int main() {
    vector<int> arr = {1, 2, 4, 4, 7, 11, 15};
    int x = 9;
    if (findPairWithSum(arr, x)) {
        cout << "Yes, a pair with the given sum exists." << endl;
    } else {
        cout << "No such pair exists." << endl;
    }
    return 0;
}