#include <algorithm>
#include <bitset>
#include <cassert>
#include <cctype>
#include <chrono>
#define _USE_MATH_DEFINES
#include <cmath>
#include <cstdio>
#include <cstring>
#include <ctime>
#include <deque>
#include <functional>
#include <iostream>
#include <iterator>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
using namespace std;

#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()

const int INF = 0x3f3f3f3f;
const long long LINF = 0x3f3f3f3f3f3f3f3fLL;
const double EPS = 1e-8;
const int MOD = 1000000007; // 998244353;
const int dy[] = {1, 0, -1, 0}, dx[] = {0, -1, 0, 1};
/*-------------------------------------------------*/
template <typename Abelian>
struct RAQ {
  RAQ(int n_, const Abelian UNITY = 0) : n(n_), UNITY(UNITY) {
    ++n;
    dat.assign(n, UNITY);
  }

  void add(int left, int right, Abelian value) {
    while (left < n) {
      dat[left] += value;
      left += left & -left;
    }
    ++right;
    while (right < n) {
      dat[right] += -value;
      right += right & -right;
    }
  }

  Abelian query(int idx) {
    Abelian res = UNITY;
    while (idx > 0) {
      res += dat[idx];
      idx -= idx & -idx;
    }
    return res;
  }

private:
  int n;
  const Abelian UNITY;
  vector<Abelian> dat;
};

template <typename Monoid>
struct RSQ {
  RSQ(int sz, const Monoid &UNITY = 0) : UNITY(UNITY) {
    init(sz);
    dat.assign((n << 1) - 1, UNITY);
  }

  RSQ(const vector<Monoid> &a, const Monoid &UNITY = 0) : UNITY(UNITY) {
    int a_sz = a.size();
    init(a_sz);
    dat.resize((n << 1) - 1);
    REP(i, a_sz) dat[n - 1 + i] = a[i];
    for (int i = n - 2; i >= 0; --i) dat[i] = dat[(i << 1) + 1] + dat[(i << 1) + 2];
  }

  void add(int node, Monoid value) {
    node += n - 1;
    dat[node] += value;
    while (node > 0) {
      node = (node - 1) >> 1;
      dat[node] = dat[(node << 1) + 1] + dat[(node << 1) + 2];
    }
  }

  Monoid sum(int a, int b) { return sum(a, b, 0, 0, n); }

  inline Monoid operator[](const int idx) const { return dat[idx + n - 1]; }

  int find(int a, int b, Monoid value) { return find(a, b, value, 0, 0, n); }

private:
  int n = 1;
  const Monoid UNITY;
  vector<Monoid> dat;

  void init(int sz) { while (n < sz) n <<= 1; }

  Monoid sum(int a, int b, int node, int left, int right) {
    if (right <= a || b <= left) return UNITY;
    if (a <= left && right <= b) return dat[node];
    return sum(a, b, (node << 1) + 1, left, (left + right) >> 1) + sum(a, b, (node << 1) + 2, (left + right) >> 1, right);
  }

  int find(int a, int b, Monoid value, int node, int left, int right) {
    if (dat[node] < value || right <= a || b <= left) return -1;
    if (right - left == 1) return node - (n - 1);
    int res_l = find(a, b, value, (node << 1) + 1, left, (left + right) >> 1);
    if (res_l != -1) return res_l;
    return find(a, b, value, (node << 1) + 2, (left + right) >> 1, right);
  }
};

int main() {
  cin.tie(nullptr); ios::sync_with_stdio(false);
  // freopen("input.txt", "r", stdin);

  int n, q; cin >> n >> q;
  RSQ<int> rsq(n);
  RAQ<long long> raq(n);
  REP(i, n) {
    int a; cin >> a;
    raq.add(i + 1, i + 1, a);
    if (i > 0 && a == raq.query(i)) rsq.add(i - 1, 1);
  }
  while (q--) {
    int query, l, r; cin >> query >> l >> r;
    if (query == 1) {
      int x; cin >> x;
      if (l - 1 > 0 && raq.query(l - 1) == raq.query(l)) rsq.add(l - 2, -1);
      if (r + 1 <= n && raq.query(r) == raq.query(r + 1)) rsq.add(r - 1, -1);
      raq.add(l, r, x);
      if (l - 1 > 0 && raq.query(l - 1) == raq.query(l)) rsq.add(l - 2, 1);
      if (r + 1 <= n && raq.query(r) == raq.query(r + 1)) rsq.add(r - 1, 1);
    } else {
      cout << r - l - rsq.sum(l - 1, r - 1) + 1 << '\n';
    }
    // REP(i, n) cout << raq.query(i + 1) << ' ';
    // cout << '\n';
    // REP(i, n) cout << rsq[i] << ' ';
    // cout << '\n';
  }
  return 0;
}