#include<iostream>
using namespace std;
int main(){
    int a,c;
    try{
        cin>>a;
        int b[a];
        for(int i=0;i<a;i++){
            cin>>b[i];
        }
        cin>>c;
        if(c>a){
            throw"-1"
            }
            cout<<b[c];
    }
    catch(const char*msg){
        cout<<msg;
    }
}