#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
#include<complex>
using namespace std;

//#define int long long
typedef long long ll;

typedef unsigned long long ul;
typedef unsigned int ui;
const ll mod = 998244353;
const ll INF = mod * mod;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef pair<ll, ll> LP;
typedef vector<ll> vec;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-5;
const ld pi = acos(-1.0);

struct BIT {
private:
	vector<ll> node; int n;
public:
	BIT(int n_) {
		n = n_; node.resize(n, 0);
	}
	//0-indexed
	void add(int a, ll w) {
		for (int i = a; i < n; i |= i + 1)node[i] += w;
	}
	//[0,a)
	ll sum(int a) {
		ll ret = 0;
		for (int i = a - 1; i >= 0; i = (i&(i + 1)) - 1)ret += node[i];
		return ret;
	}
	//[a,b)
	ll sum(int a, int b) {
		return sum(b) - sum(a);
	}
};

void solve() {
	int n, q; cin >> n >> q;
	BIT b(n - 1);
	vector<ll> a(n);
	rep(i, n) {
		cin >> a[i];
	}
	vector<ll> d(n-1);
	rep(i, n - 1) {
		d[i] = a[i + 1] - a[i];
		if (d[i] != 0) {
			b.add(i, 1);
		}
	}
	rep(i, q) {
		int t; cin >> t;
		if (t == 1) {
			int l, r; ll x; cin >> l >> r >> x;
			l--; r--;
			if (l > 0) {
				d[l - 1] += x;
				if (d[l - 1] == x) {
					b.add(l - 1, 1);
				}
				else if(d[l-1]==0){
					b.add(l - 1, -1);
				}
			}
			if (r < n - 1) {
				d[r] += x;
				if (d[r] == x) {
					b.add(r, 1);
				}
				else if(d[r]==0){
					b.add(r, -1);
				}
			}
		}
		else {
			int l, r; cin >> l >> r;
			l--; r--;
			int ans = 1 + b.sum(l, r);
			cout << ans << endl;
		}
	}
}

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	//cout << fixed << setprecision(50);
	//init();
	solve();

	//cout << "finish" << endl;
	//stop
		return 0;
}