#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

template<class Val>
struct BinaryIndexedTree {
    int n;
    vector<Val> t;
    BinaryIndexedTree() {}
    BinaryIndexedTree(int _n) :n(_n + 1), t(_n + 1) {}
    void add(int k, Val val) {
        k++;
        while (k < n) {
            t[k] += val;
            k += (k&-k);
        }
    }
    void set(int k, Val val) {
        add(k, -sum(k, k + 1));
        add(k, val);
    }
    Val sum(int k) {
        Val r = 0;
        while (k > 0) {
            r += t[k];
            k -= (k&-k);
        }
        return r;
    }
    Val sum(int l, int r) {
        return sum(r) - sum(l);
    }
};

void solve() {
    int N, Q;
    cin >> N >> Q;
    vi A(N);
    vll diff(N - 1);
    BinaryIndexedTree<int> cnt(N - 1);
    rep(i, N) cin >> A[i];
    auto add = [&](int k, int x) {
        if (k<0 || k>=N - 1)return;
        if(diff[k]==0 && x) cnt.add(k, 1);
        else if(diff[k] && diff[k] + x == 0) cnt.add(k, -1);
        diff[k] += x;
    };
    rep(i, N - 1) {
        if (A[i + 1] == A[i])cnt.add(i, 1);
        diff[i] = A[i + 1] - A[i];
    }
    rep(ITER, Q) {
        int q, l, r;
        cin >> q >> l >> r;
        --l;
        if (q == 1) {
            int x;
            cin >> x;
            add(l - 1, x);
            add(r - 1, -x);
        } else {
            cout << cnt.sum(l, r - 1) << endl;
        }
    }
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}