using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;

partial class Solver
{
    public void Run()
    {
        var N = ni();
        var Q = ni();
        var A = ni(N);

        var connectTree = new AnonymousSegmentTree<long>((a, b) => a + b);
        connectTree.Build(N, a => 0);
        var attractiveTree = new AnonymousSegmentTree<long>((a, b) => a + b);
        attractiveTree.Build(N, a => A[a]);

        for (int i = 0; i < Q; i++)
        {
            var q = ni();
            var x = ni() - 1;
            switch (q)
            {
                case 1: // connect
                    connectTree.Update(x, 1);
                    break;
                case 2:
                    connectTree.Update(x, 0);
                    break;
                case 3:
                    var current = attractiveTree.Query(x, x + 1);
                    attractiveTree.Update(x, current + 1);
                    break;
                case 4:
                    {
                        var lower = x;
                        var upper = x;
                        for (int d = (1 << 20); d > 0; d >>= 1)
                        {
                            if (lower - d >= 0 && connectTree.Query(lower - d, x) == x - (lower - d))
                            {
                                lower -= d;
                            }
                            if (upper + d < N && connectTree.Query(upper, upper + d) == (upper + d) - upper)
                            {
                                upper += d;
                            }
                        }
                        cout.WriteLine(attractiveTree.Query(lower, upper + 1));
                    }
                    break;
            }
        }
    }
}

public abstract class SegmentTree<TNodeValue> where TNodeValue : struct
{
    protected int N { get; private set; }
    protected TNodeValue?[] node;
    protected static int Left(int p) { return p * 2 + 1; }
    protected static int Right(int p) { return p * 2 + 2; }

    public SegmentTree() { }

    public void Build(IList<TNodeValue> array)
    {
        Build(array.Count, i => array[i]);
    }

    virtual public void Build(int _n, Func<int, TNodeValue> create)
    {
        N = 1;
        while (N < _n) N *= 2;
        node = new TNodeValue?[2 * N];

        for (int i = 0; i < _n; i++) node[i + N - 1] = create(i);
        for (int i = N - 2; i >= 0; i--) node[i] = Merge(node[Left(i)], node[Right(i)]);
    }

    protected TNodeValue? Merge(TNodeValue? left, TNodeValue? right)
    {
        if (left != null && right != null) return Merge(left.Value, right.Value);
        if (left == null) return right;
        if (right == null) return left;
        return null;
    }

    protected abstract TNodeValue Merge(TNodeValue left, TNodeValue right);

    public void Update(int index, TNodeValue val)
    {
        int p = index + N - 1;
        node[p] = val;
        while (p > 0)
        {
            p = (p - 1) / 2;
            node[p] = Merge(node[Left(p)], node[Right(p)]);
        }
    }

    protected virtual TNodeValue? Query(int begin, int end, int k, int l, int r)
    {
        if (r <= begin || end <= l) return null;
        if (begin <= l && r <= end) return node[k];
        int mid = (l + r) / 2;
        return Merge(
            Query(begin, end, Left(k), l, mid),
            Query(begin, end, Right(k), mid, r)
        );
    }

    public TNodeValue Query(int begin, int end)
    {
        return Query(begin, end, 0, 0, N).Value;
    }
};

public class RMQSegmentTree : SegmentTree<int>
{
    protected override int Merge(int x, int y)
    {
        return Math.Max(x, y);
    }
}

public class AnonymousSegmentTree<TNodeValue> : SegmentTree<TNodeValue> where TNodeValue : struct
{
    readonly Func<TNodeValue, TNodeValue, TNodeValue> _mergeMethod;

    public AnonymousSegmentTree(Func<TNodeValue, TNodeValue, TNodeValue> merge)
    {
        _mergeMethod = merge;
    }

    protected override TNodeValue Merge(TNodeValue left, TNodeValue right)
    {
        return _mergeMethod(left, right);
    }
}

// PREWRITEN CODE BEGINS FROM HERE
partial class Solver : Scanner
{
    public static void Main(string[] args)
    {
        new Solver(Console.In, Console.Out).Run();
    }

    TextReader cin;
    TextWriter cout;

    public Solver(TextReader reader, TextWriter writer)
        : base(reader)
    {
        this.cin = reader;
        this.cout = writer;
    }
    public Solver(string input, TextWriter writer)
        : this(new StringReader(input), writer)
    {
    }

    public int ni() { return NextInt(); }
    public int[] ni(int n) { return NextIntArray(n); }
    public long nl() { return NextLong(); }
    public long[] nl(int n) { return NextLongArray(n); }
    public double nd() { return NextDouble(); }
    public string ns() { return Next(); }
}

public class Scanner
{
    private TextReader Reader;
    private Queue<String> TokenQueue = new Queue<string>();
    private CultureInfo ci = CultureInfo.InvariantCulture;

    public Scanner()
        : this(Console.In)
    {
    }

    public Scanner(TextReader reader)
    {
        this.Reader = reader;
    }

    public int NextInt() { return Int32.Parse(Next(), ci); }
    public long NextLong() { return Int64.Parse(Next(), ci); }
    public double NextDouble() { return double.Parse(Next(), ci); }
    public string[] NextArray(int size)
    {
        var array = new string[size];
        for (int i = 0; i < size; i++) array[i] = Next();
        return array;
    }
    public int[] NextIntArray(int size)
    {
        var array = new int[size];
        for (int i = 0; i < size; i++) array[i] = NextInt();
        return array;
    }

    public long[] NextLongArray(int size)
    {
        var array = new long[size];
        for (int i = 0; i < size; i++) array[i] = NextLong();
        return array;
    }

    public String Next()
    {
        if (TokenQueue.Count == 0)
        {
            if (!StockTokens()) throw new InvalidOperationException();
        }
        return TokenQueue.Dequeue();
    }

    public bool HasNext()
    {
        if (TokenQueue.Count > 0)
            return true;
        return StockTokens();
    }

    private bool StockTokens()
    {
        while (true)
        {
            var line = Reader.ReadLine();
            if (line == null) return false;
            var tokens = line.Trim().Split(" ".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
            if (tokens.Length == 0) continue;
            foreach (var token in tokens)
                TokenQueue.Enqueue(token);
            return true;
        }
    }
}