#include<bits/stdc++.h>

using namespace std;

#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define pf push_front
#define LC k<<1
#define RC k<<1|1
#define IO cin.sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define all(x) (x).begin(), (x).end()
#define SZ(x) ((int)(x).size())
#define rep(i, a, n) for (int i = a; i < n; i++)
#define repn(i, a, n) for (int i = a; i <= n; i++)
#define per(i, a, n) for (int i = (n) - 1; i >= a; i--)
#define pern(i, a, n) for (int i = n; i >= a; i--)

typedef long long LL;
typedef long double LD;
typedef unsigned long long ull;
typedef pair<int, int> PII;
typedef pair<int, LL> PIL;
typedef pair<LL, int> PLI;
typedef pair<double, double> PDD;
typedef pair<ull, ull> PUU;
typedef pair<LL, LL> PLL;

const int N = 210000;
const int M = 1100000;
const int mod = 1e9+7;
const int inf = (int)1e9;
const LL INF = 1e18;
const double eps = 1e-9;

mt19937_64 Rand((unsigned long long)new char);
#define rand Rand

int n, m;
LL add[M], cov[M], sum[M], rval[M], lval[M];
LL a[N], len1[M], len2[M], al[M], ar[M];

void update(int k) {
	sum[k] = sum[LC] + sum[RC];
	len1[k] = len1[LC] + len1[RC];
	len2[k] = len2[LC] + len2[RC];
	lval[k] = lval[LC];
	rval[k] = rval[RC];
}
void apply_cov(int k, LL v) {
	sum[k] = len1[k] * v;
	lval[k] = rval[k] = v;
	add[k] = 0;
	cov[k] = v;
}
void apply_add(int k, LL v) {
	sum[k] += len2[k] * v;
	rval[k] += ar[k] * v;
	lval[k] += al[k] * v;
	add[k] += v;
}
void pushdown(int k) {
	if (cov[k] != -1) {
		apply_cov(LC, cov[k]);
		apply_cov(RC, cov[k]);
		cov[k] = -1;
	}
	if (add[k]) {
		apply_add(LC, add[k]);
		apply_add(RC, add[k]);
		add[k] = 0;
	}
}
void build(int k, int l, int r) {
	al[k] = l, ar[k] = r;
	cov[k] = -1;
	if (l == r) {
		sum[k] = a[l];
		len1[k] = 1;
		len2[k] = l;
		lval[k] = rval[k] = a[l];
		return;
	}
	int mid = (l + r) / 2;
	build(LC, l, mid);
	build(RC, mid + 1, r);
	update(k);
}
void change1(int k, int l, int r, LL v) {
	if (rval[k] <= v) return;
	if (lval[k] >= v) {
		apply_cov(k, v);
		return;
	}
	pushdown(k);
	int mid = (l + r) / 2;
	if (lval[RC] <= v) change1(RC, mid + 1, r, v);
	else apply_cov(RC, v), change1(LC, l, mid, v);
	update(k);
}
LL ask(int k, int l, int r, int a, int b) {
	if (l == a && r == b) return sum[k];
	int mid = (l + r) / 2;
	pushdown(k);
	if (b <= mid) return ask(LC, l, mid, a, b);
	else if (a > mid) return ask(RC, mid + 1, r, a, b);
	else return ask(LC, l, mid, a, mid) + ask(RC, mid + 1, r, mid + 1, b);
}
int main() {
	IO;
	cin >> n >> m;
	repn(i, 1, n) cin >> a[i];
	build(1, 1, n);
	while (m--) {
		int op;
		cin >> op;
		if (op == 1) {
			LL mn;
			cin >> mn;
			change1(1, 1, n, mn);
		}
		else if (op == 2) apply_add(1, 1);
		else {
			int l, r;
			cin >> l >> r;
			LL res = ask(1, 1, n, l, r);
			cout << res << "\n";
		}
	}
	return 0;
}