#include <iostream>
using namespace std;
 
int main() {
    int n, st[100], top = -1;
    cin >> n;
 
    while (n) {
        int op;
        cin >> op;
 
        if (op == 1) {
            int x;
            cin >> x;
            top++;
            st[top] = x;
        }
        else if (op == 2 && top >= 0) {
            top--;
        }
        else if (op == 3) {
            if (top >= 0) {
                cout << st[top] << endl;
            }
            else {
                cout << "Stiva goala" << endl;
            }
        }
 
        n--;   // trebuie sa scada la fiecare iteratie
    }
 
    return 0;
}

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1 20
2
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