#include<iostream>
#include<vector>
using namespace std;
int main(){
    int n;
    cin >> n;
    
    vector<int>arr(n);
    for(int i=0;i<n;i++){
        cin>>arr[i];
    }
    int index;
    cin>>index;
    try{
        if(index<0||index>=n){
            throw out_of_range("index out of bounds");
        }
        cout<<arr[index];
    }catch(..){
        cout<<-1;
    }
    return 0;
}