Untitled

// Thongriu
#include <bits/stdc++.h>
#define endl '\n'
#define maxn 100005
#define MAX  1000005
#define MOD 1000000007
#define TASK "test"
#define ll long long
using namespace std;

int n, q, t[maxn], v[maxn], cnt = 0, res = 0;
int a[maxn], b[maxn], x[maxn];
int dem[MAX], lab[MAX];
char c[maxn];
multiset<int> ms;

int whatsub(){
    if(n <= 1000 && q <= 1000) return 1;

    for(int i = 1; i <= n; i++)
        if(t[i] > 1000000) return 5;

    bool sub2 = 1, sub3 = 1;
    for(int i = 1; i <= q; i++){
        if(x[i] > 1000000) return 5;
        if(a[i] != 1 || b[i] != 1000000) return 4;
        if(c[i] == '-') sub2 = 0;
        if(c[i] == '+') sub3 = 0;
    }

    if(sub2) return 2;
    if(sub3) return 3;
    return 4;
}

void xoasub1(int x){
    auto it = ms.find(x);
    if(it != ms.end()) ms.erase(it);
}

void themsub1(int x){
    ms.insert(x);
}

void truyvansub1(int a, int b){
    cnt = 0;
    res = 0;
    for(int x : ms)
        if(x >= a && x <= b) v[++cnt] = x;

    sort(v + 1, v + cnt + 1);
    cnt = unique(v + 1, v + cnt + 1) - (v + 1);



    for(int l = 1; l <= cnt;){
        int r = l;
        while(r <= cnt && v[r] + 1 == v[r + 1]) r++;
        res = max(res, r - l + 1);
        l = r + 1;
    }

    cout << res << "\n";
}

void sub1(){
    for(int i = 1; i <= n; i++)
        ms.insert(t[i]);

    for(int i = 1; i <= q; i++){
        if(c[i] == '+') themsub1(x[i]);
        if(c[i] == '-') xoasub1(x[i]);
        if(c[i] == '?') truyvansub1(a[i], b[i]);
    }
}

int getroot(int u){
    if(lab[u] < 0) return u;
    return (lab[u] = getroot(lab[u]));
}

void join(int u, int v){
    int x = getroot(u), y = getroot(v);
    if(x == y) return;

    if(lab[x] > lab[y]) swap(x, y);
    lab[x] += lab[y];
    res = max(res, -lab[x]);
    lab[y] = x;
}

void sub2(){
    memset(lab, -1, sizeof(lab));
    for(int i = 1; i <= n; i++){
        dem[t[i]]++;
        if(dem[t[i] - 1] > 0) join(t[i], t[i] - 1);
        if(dem[t[i] + 1] > 0) join(t[i], t[i] + 1);
    }

    for(int i = 1; i <= q; i++){
        if(c[i] == '+'){
            dem[x[i]]++;
            if(dem[x[i] - 1] > 0) join(x[i], x[i] - 1);
            if(dem[x[i] + 1] > 0) join(x[i], x[i] + 1);
        }
        else cout << res << "\n";
    }
}

int main()
{
    ios_base:: sync_with_stdio(0);
    cin.tie(nullptr);
    if(fopen(TASK".inp","r")){
        freopen(TASK".inp","r",stdin);
        freopen(TASK".ans","w",stdout);
    }

    cin >> n >> q;
    for(int i = 1; i <= n; i++)
        cin >> t[i];

    for(int i = 1; i <= q; i++){
        cin >> c[i];

        if(c[i] == '+' || c[i] == '-') cin >> x[i];
            else cin >> a[i] >> b[i];
    }

    int sub = whatsub();
    sub1();
//        else if(sub == 2) sub2();
}