#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint1000000007;
//const int mod = 1000000007;
//using mint = modint998244353;
//const int mod = 998244353;
//const int INF = 1e9;
//const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define endl "\n"
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
int op(int a, int b) { return a + b; }
int e() { return 0; }
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	int n, q; cin >> n >> q;
	vector<int>a(n), b(n - 1), c(n - 1);
	rep(i, n)cin >> a[i];
	rep(i, n - 1)b[i] = a[i + 1] - a[i];
	rep(i, n - 1)if (0 != b[i])c[i] = 1;
	segtree<int, op, e>seg(c);
	while (q--) {
		int t; cin >> t;
		if (1 == t) {
			int l, r, x; cin >> l >> r >> x;
			l--, r--;
			if (0 != l) {
				b[l - 1] += x;
				seg.set(l - 1, !!b[l - 1]);
			}
			if (n - 1 != r) {
				b[r] -= x;
				seg.set(r, !!b[r]);
			}
		}
		else {
			int l, r; cin >> l >> r;
			l--, r--;
			auto get = seg.prod(l, r);
			cout << get + 1 << endl;
		}
	}
	return 0;
}