#include<bits/stdc++.h>
using namespace std;

template<class T>
struct BIT{
    vector<T> bit;
    BIT(int n) : bit(n, 0){}
    T range_sum(int i, int j) {return sum(j) - sum(i - 1);}
    // return sum of v[i] to v[j] including both ends.
    T sum(int j){
        T s = 0;
        for (; j >= 0; j = (j & (j + 1)) - 1) s += bit[j];
        return s;
    }
    void add(int k, T a) {for (; k < bit.size(); k |= k + 1) bit[k] += a;}
};

template<class T>
struct BITrange{
    vector<T> bit;
    BITrange(int n) : bit(n, 0){}
    T range_sum(int i, int j) {return sum(j - 1) - sum(i - 1);}
    // return sum of v[i] to v[j - 1].
    T sum(int j){
        T s = 0;
        for (; j >= 0; j = (j & (j + 1)) - 1) s += bit[j];
        return s;
    }
    void add(int k, T a) {for (; k < bit.size(); k |= k + 1) bit[k] += a;}
    int queryR(int k){
        auto sum_to_k_minus_k = this->sum(k - 1) - k;
        if (this->sum(bit.size() - 1) == bit.size() + sum_to_k_minus_k) return bit.size();
        int OK = k;
        int NG = bit.size();
        while (OK + 1 < NG){
            int mid = (OK + NG) / 2;
            if (this->sum(mid - 1) == mid + sum_to_k_minus_k){
                OK = mid;
            }else{
                NG = mid;
            }
        }
        return OK;
    }
    int queryL(int k){
        auto tmp = k - this->sum(k - 1); 
        if (tmp == 0) return 0;
        int OK = k;
        int NG = 0;
        while (NG + 1 < OK){
            int mid = (OK + NG) / 2;
            if (mid - this->sum(mid - 1) == tmp){
                OK = mid;
            }else{
                NG = mid;
            }
        }
        return OK;
    }
};

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N, Q;
    cin >> N >> Q;
    BIT<long long> bit(N);
    for (int i = 0; i < N; ++i){
        long long a;
        cin >> a;
        bit.add(i, a);
    }
    BITrange<int> bitr(N);
    while (Q--){
        int q, x;
        cin >> q >> x;
        if (q == 1){
            if (bitr.range_sum(x - 1, x) == 0){
                bitr.add(x - 1, 1);
            }
        }else if (q == 2){
            if (bitr.range_sum(x - 1, x) == 1){
                bitr.add(x - 1, -1);
            }
        }else if (q == 3){
            bit.add(x - 1, 1LL);
        }else if (q == 4){
            int R = bitr.queryR(x - 1);
            int L = bitr.queryL(x - 1);
            cout << bit.range_sum(L, R) << '\n';
        }
    }
    return 0;
}