#include<bits/stdc++.h> using namespace std; int main(){ int a[101],tem; cin>>n; for(int i = 1;i<=n;i+=1){ cin>>a[i]; } for(int i = 2;i<=n;i+=2){ cin>>a[i]; } tem=a[i]; a[i-1]=a[i]; a[i-1]=tem; cout<<tem; return 0; }