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