#include<iostream>
using namespace std;
int main()
{
    int n;
    cin>>n;
    int arr[10]
    for(int i=0;i<n;i++)
    cin>>arr[i]
    int index;
    cin>>index;
    try
    {
        if(index<0||index>=0)
           throwout_of_range("Invalid");
        cout<<arr[index];   
    }
    catch(...){
        cout<<-1;
    }
    return 0;
}