#include <iostream>
#include <vector>
using namespace std;

int main() {
int n, cmd, tmp;
vector <int> S;
cin >> n;

while ( n-- ) {
cin >> cmd;

if ( 1 == cmd )
S.pop_back();
else if ( 2 == cmd )
cout << S.back() << endl;
else {
cin >> tmp;
S.push_back ( tmp );
}
}

return 0;
}