#include <iostream>
using namespace std;
int main() {
    long arr[200001], sum;
    int n, t, count = 1;
    bool sign = 0;
    cin >> n;
    cin >> t >> arr[0];
    cout << arr[0] << endl;
    sum = arr[0];
    for (int m = 1; m < n; ++m) {
        cin >> t;
        if (t == 2) {
            cin >> arr[count];
            for (int i = 0; i < count; ++i) {
                if (arr[i] == arr[count]) {
                    arr[i] = 0;
                    sign = 1;
                }
            }
            if (sign) {
                sum = arr[0];
                for (int i = 1; i < count; ++i) sum = sum ^ arr[i];
                sign = 0;
            } else {
                sum = sum ^ arr[count++];
            }
            cout << sum << endl;
        } else {
            sum = ++arr[0];
            for (int i = 1; i < count; ++i) {
                if (arr[i] == 0)
                    sum = sum ^ 0;
                else
                    sum = sum ^ (++arr[i]);
            }
            cout << sum << endl;
        }
    }
}