#include<iostream>
#include<vector>
using namespace std;
int main(){
    int n;
    cin >> n;
    
    vector<int> arr;
    
    for (int i = 0; i < n; i++0){
        int x;
        cin>>x;
        arr.push_back(x);
    }
    
    int index;
    cin >> index;
    
    try {
        cout << arr.at(index);
    }
    catch (out_of_range &e) {
        cout << -1;
    }
    return 0;
}