#include<iostream>
#include<vector>
#include<stdexcept>

using namespace std;

int main(){
    int n,index;
    if(!(cin>>n))return 0;
    
    vector<int>data(n);
    for(int i=0;i<n;i++) cin>>data[i];
    cin>>index;
    
    try{
        cout<<data.at(index)<<endl;
    }catch(cont out_of_range& e){
        cout<<-1<<endl;
    }
    return 0;
}