#include<iostream>
using namespace std;
int main()
{
    int n,index;
    cin>>n;
    for(int i=0;i<n;i++)
    cin>>arr[i];
    cin>>index;
    if(index>=0&&index<n)
    cout<<arr[index];
    else
    {
        cout<<-1;
    }
    return 0;
}