#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

int array[20005];

int inca(int* array, int n);
int yihuo(int x, int y);
int insert(int* array, int n, int x);

int main() {
    int n;
    scanf("%d", &n);
    int flag, x;
    int data = 0;
    int top = 0;
    for (int i = 0; i < n; i++) {
        scanf("%d", &flag);
        if (flag == 1) {
            inca(&array, top);
            data = array[0];
            for (int j = 1; j < top; j++) {
                data = yihuo(data, array[j]);
            }
            printf("%d\n", data);
        } else if (flag == 2) {
            scanf("%d", &x);
            top = insert(&array, top, x);
            data = yihuo(data, x);
            printf("%d\n", data);
        }
    }
    return 0;
}

int inca(int* array, int n) {
    for (int i = 0; i < n; i++) {
        array[i]++;
    }
    return 0;
}

int yihuo(int x, int y) {
    int data1, data2;
    int sum = 0, flag = 1;
    while (x != 0 || y != 0) {
        data1 = x % 2;
        data2 = y % 2;
        x /= 2;
        y /= 2;
        if (data1 != data2) {
            sum += flag;
        }
        flag *= 2;
    }
    return sum;
}

int insert(int* array, int n, int x) {
    array[n] = x;
    return n + 1;
}