#include <bits/stdc++.h>
#define int long long

signed main() {
    int N;
    scanf("%lld", &N);
    int* a = (int*)malloc((N + 1) * sizeof(int));
    // printf("%lld", a[10]); //test1
    int flag = 0, count = 0;
    for (int i = 1; i < N; ++i) {
        scanf("%lld", &flag);
        if (flag == 1 && count > 0) {
            for (int j = 1; j <= count; ++j) {
                ++a[j];
            }
        } else if (flag == 2) {
            ++count;
            int temp;
            scanf("%lld", &temp);
            a[count] = temp;
        }
        int temp = a[1];
        for (int k = 1; k < count; ++k) {
            temp ^= a[k + 1];
        }
        printf("%lld\n", temp);
    }
    scanf("%lld", &flag);
    if (flag == 1 && count > 0) {
        for (int j = 1; j <= count; ++j) {
            ++a[j];
        }
    } else if (flag == 2) {
        ++count;
        int temp;
        scanf("%lld", &temp);
        a[count] = temp;
    }
    int temp = a[1];
    for (int k = 1; k < count; ++k) {
        temp ^= a[k + 1];
    }
    printf("%lld", temp);
    return 0;
}