bool debug = false;
#include <stdio.h>
constexpr int kN = int(1E5 + 10), kInf = int(1E9 + 10);
struct seg_tree {
	int val[kN << 2];
	long long int flag[kN << 2], left[kN << 2], right[kN << 2];
	void pull(int n) {
		val[n] = val[n * 2 + 1] + val[n * 2 + 2];
		left[n] = left[n * 2 + 1];
		right[n] = right[n * 2 + 2];
		if (left[n * 2 + 2] != right[n * 2 + 1]) val[n]++;
		return ;
	}
	void addtag(int n, int x) {
		left[n] += x;
		right[n] += x;
		flag[n] += x;
		return ;
	}
	void push(int n) {
		if (flag[n]) {
			addtag(n * 2 + 1, flag[n]);
			addtag(n * 2 + 2, flag[n]);
			flag[n] = 0;
		}
		return ;
	}
	void init(int n, int l, int r, int a[]) {
		flag[n] = 0;
		if (l == r) {
			val[n] = 0;
			left[n] = right[n] = a[l];
		}
		else {
			int mid = (l + r) >> 1;
			init(n * 2 + 1, l, mid, a);
			init(n * 2 + 2, mid + 1, r, a);
			pull(n);
		}
		return ;
	}
	void fix(int n, int l, int r, int L, int R, int x) {
		if (L <= l && r <= R) addtag(n, x);
		else if (!(L > r || l > R)){
			int mid = (l + r) >> 1;
			push(n);
			fix(n * 2 + 1, l, mid, L, R, x);
			fix(n * 2 + 2, mid + 1, r, L, R, x);
			pull(n);
		}
		if (debug) printf("l = %d, r = %d, val = %d, left = %lld, right = %lld\n", l, r, val[n], left[n], right[n]);
		return ;
	}
	int ask(int n, int l, int r, int L, int R, long long int &lv, long long int &rv) {
		if (L <= l && r <= R) {
			lv = left[n];
			rv = right[n];
			return val[n];
		}
		else if (L > r || l > R) {
			lv = rv = -1;
			return 0;
		}
		else {
			push(n);
			int mid = (l + r) >> 1, ans;
			long long int ll, lr, rl, rr;
			ans = ask(n * 2 + 1, l, mid, L, R, ll, lr) + ask(n * 2 + 2, mid + 1, r, L, R, rl, rr);
			if (lr != rl && lr != -1 && rl != -1) ans++;
			lv = ll;
			rv = rr;
			return ans;
		}
	}
};

seg_tree sg;
int a[kN];

int main () {
	int n, q, l, r, k, x;
	long long int p;
	scanf("%d%d", &n, &q);
	for (int i = 1; i <= n; i++) scanf("%d", &a[i]);
	sg.init(0, 1, n, a);
	while (q--) {
		scanf("%d%d%d", &k, &l, &r);
		if (k == 1) {
			scanf("%d", &x);
			sg.fix(0, 1, n, l, r, x);
		}
		else printf("%d\n", sg.ask(0, 1, n, l, r, p, p) + 1);
	}
}