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