#include <iostream>
#include <cmath>


int main() {
    int n;
    std::cin >> n;
    int num[n];
    for (int i = 0; i < n; ++i)
        std::cin >> num[i];
    int x;
    std::cin >> x;
    int res = abs(num[0] - x);
    int element = num[0];
    for (int i = 1; i < n; ++i){
        if (abs(num[i] - x) < res){
            res = abs(num[i] - x);
            element = num[i];
        }

    }
    std::cout << element;

    return 0;
}