package main

import (
	"bufio"
	"fmt"
	"os"
	"sort"
	"strconv"
)

func out(x ...interface{}) {
	fmt.Println(x...)
}

var sc = bufio.NewScanner(os.Stdin)

func getInt() int {
	sc.Scan()
	i, e := strconv.Atoi(sc.Text())
	if e != nil {
		panic(e)
	}
	return i
}

func getInts(N int) []int {
	ret := make([]int, N)
	for i := 0; i < N; i++ {
		ret[i] = getInt()
	}
	return ret
}

func getString() string {
	sc.Scan()
	return sc.Text()
}

// min, max, asub, absなど基本関数
func max(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func asub(a, b int) int {
	if a > b {
		return a - b
	}
	return b - a
}

func abs(a int) int {
	if a >= 0 {
		return a
	}
	return -a
}

func lowerBound(a []int, x int) int {
	idx := sort.Search(len(a), func(i int) bool {
		return a[i] >= x
	})
	return idx
}

func upperBound(a []int, x int) int {
	idx := sort.Search(len(a), func(i int) bool {
		return a[i] > x
	})
	return idx
}

func main() {
	sc.Split(bufio.ScanWords)
	sc.Buffer([]byte{}, 1000000)
	N, Q := getInt(), getInt()
	a := make([]S, N)
	for i := 0; i < N; i++ {
		a[i] = S{getInt()}
	}
	segL := SegtreeInit(N, 0)
	for i := 1; i < N; i++ {
		if a[i].a == a[i-1].a {
			segL.Set(i-1, 1)
		}
	}
	segL.Update()
	seg := newLazySegtree(a, e, merger, mapper, comp, id)

	for i := 0; i < Q; i++ {
		op := getInt()
		if op == 1 {
			l, r, x := getInt()-1, getInt()-1, getInt()
			seg.RangeApply(l, r+1, F{x})
			if l != 0 {
				p := seg.Prod(l-1, l)
				q := seg.Prod(l, l+1)
				if p.a == q.a {
					segL.UpdateAt(l-1, 1)
				} else {
					segL.UpdateAt(l-1, 0)
				}
			}
			if r != N-1 {
				p := seg.Prod(r, r+1)
				q := seg.Prod(r+1, r+2)
				if p.a == q.a {
					segL.UpdateAt(r, 1)
				} else {
					segL.UpdateAt(r, 0)
				}
			}
		} else {
			l, r := getInt()-1, getInt()-1
			p := int(segL.Query(l, r+1))
			q := int(segL.Query(r, r+1))
			if q == 1 {
				p--
			}
			out(r - l + 1 - p)
		}
		// for j := 0; j < N; j++ {
		// 	fmt.Print(seg.Prod(j, j+1), " ")
		// }
		// for j := 0; j < N; j++ {
		// 	fmt.Print(segL.Query(j, j+1), " ")
		// }
		// fmt.Println()
	}
}

func e() S {
	return S{-1}
}

func merger(l, r S) S {
	if l.a > r.a {
		return l
	}
	return r
}

func mapper(f F, x S) S {
	return S{x.a + f.a}
}

func comp(f, g F) F {
	return F{f.a + g.a}
}

func id() F {
	return F{0}
}

type S struct {
	a int
}

type F struct {
	a int
}
type E func() S
type Merger func(a, b S) S
type Mapper func(f F, x S) S
type Comp func(f, g F) F
type Id func() F
type Compare func(v S) bool
type LazySegtree struct {
	n      int
	size   int
	log    int
	d      []S
	lz     []F
	e      E
	merger Merger
	mapper Mapper
	comp   Comp
	id     Id
}

func newLazySegtree(v []S, e E, merger Merger, mapper Mapper, comp Comp, id Id) *LazySegtree {
	lseg := new(LazySegtree)
	lseg.n = len(v)
	lseg.log = lseg.ceilPow2(lseg.n)
	lseg.size = 1 << uint(lseg.log)
	lseg.d = make([]S, 2*lseg.size)
	lseg.e = e
	lseg.lz = make([]F, lseg.size)
	lseg.merger = merger
	lseg.mapper = mapper
	lseg.comp = comp
	lseg.id = id
	for i, _ := range lseg.d {
		lseg.d[i] = lseg.e()
	}
	for i, _ := range lseg.lz {
		lseg.lz[i] = lseg.id()
	}
	for i := 0; i < lseg.n; i++ {
		lseg.d[lseg.size+i] = v[i]
	}
	for i := lseg.size - 1; i >= 1; i-- {
		lseg.Update(i)
	}
	return lseg
}
func (lseg *LazySegtree) Update(k int) {
	lseg.d[k] = lseg.merger(lseg.d[2*k], lseg.d[2*k+1])
}
func (lseg *LazySegtree) AllApply(k int, f F) {
	lseg.d[k] = lseg.mapper(f, lseg.d[k])
	if k < lseg.size {
		lseg.lz[k] = lseg.comp(f, lseg.lz[k])
	}
}
func (lseg *LazySegtree) Push(k int) {
	lseg.AllApply(2*k, lseg.lz[k])
	lseg.AllApply(2*k+1, lseg.lz[k])
	lseg.lz[k] = lseg.id()
}
func (lseg *LazySegtree) Set(p int, x S) {
	p += lseg.size
	for i := lseg.log; i <= 1; i-- {
		lseg.Push(p >> uint(i))
	}
	lseg.d[p] = x
	for i := 1; i <= lseg.log; i++ {
		lseg.Update(p >> uint(i))
	}
}
func (lseg *LazySegtree) Get(p int) S {
	p += lseg.size
	for i := lseg.log; i >= 1; i-- {
		lseg.Push(p >> uint(i))
	}
	return lseg.d[p]
}
func (lseg *LazySegtree) Prod(l, r int) S {
	if l == r {
		return lseg.e()
	}
	l += lseg.size
	r += lseg.size
	for i := lseg.log; i >= 1; i-- {
		if (l>>uint(i))<<uint(i) != l {
			lseg.Push(l >> uint(i))
		}
		if (r>>uint(i))<<uint(i) != r {
			lseg.Push(r >> uint(i))
		}
	}
	sml, smr := lseg.e(), lseg.e()
	for l < r {
		if (l & 1) == 1 {
			sml = lseg.merger(sml, lseg.d[l])
			l++
		}
		if (r & 1) == 1 {
			r--
			smr = lseg.merger(lseg.d[r], smr)
		}
		l >>= 1
		r >>= 1
	}
	return lseg.merger(sml, smr)
}
func (lseg *LazySegtree) AllProd() S {
	return lseg.d[1]
}
func (lseg *LazySegtree) Apply(p int, f F) {
	p += lseg.size
	for i := lseg.log; i >= 1; i-- {
		lseg.Push(p >> uint(i))
	}
	lseg.d[p] = lseg.mapper(f, lseg.d[p])
	for i := 1; i <= lseg.log; i++ {
		lseg.Update(p >> uint(i))
	}
}
func (lseg *LazySegtree) RangeApply(l int, r int, f F) {
	if l == r {
		return
	}
	l += lseg.size
	r += lseg.size
	for i := lseg.log; i >= 1; i-- {
		if (l>>uint(i))<<uint(i) != l {
			lseg.Push(l >> uint(i))
		}
		if (r>>uint(i))<<uint(i) != r {
			lseg.Push((r - 1) >> uint(i))
		}
	}
	l2, r2 := l, r
	for l < r {
		if l&1 == 1 {
			lseg.AllApply(l, f)
			l++
		}
		if r&1 == 1 {
			r--
			lseg.AllApply(r, f)
		}
		l >>= 1
		r >>= 1
	}
	l, r = l2, r2
	for i := 1; i <= lseg.log; i++ {
		if (l>>uint(i))<<uint(i) != l {
			lseg.Update(l >> uint(i))
		}
		if (r>>uint(i))<<uint(i) != r {
			lseg.Update((r - 1) >> uint(i))
		}
	}
}
func (lseg *LazySegtree) MaxRight(l int, cmp Compare) int {
	if l == lseg.n {
		return lseg.n
	}
	l += lseg.size
	for i := lseg.log; i >= 1; i-- {
		lseg.Push(l >> uint(i))
	}
	sm := lseg.e()
	for {
		for l%2 == 0 {
			l >>= 1
		}
		if !cmp(lseg.merger(sm, lseg.d[l])) {
			for l < lseg.size {
				lseg.Push(l)
				l = 2 * l
				if cmp(lseg.merger(sm, lseg.d[l])) {
					sm = lseg.merger(sm, lseg.d[l])
					l++
				}
			}
			return l - lseg.size
		}
		sm = lseg.merger(sm, lseg.d[l])
		l++
		if l&-l == l {
			break
		}
	}
	return lseg.n
}
func (lseg *LazySegtree) MinLeft(r int, cmp Compare) int {
	if r == 0 {
		return 0
	}
	r += lseg.size
	for i := lseg.log; i >= 1; i-- {
		lseg.Push(r - 1>>uint(i))
	}
	sm := lseg.e()
	for {
		r--
		for r > 1 && r%2 != 0 {
			r >>= 1
		}
		if !cmp(lseg.merger(lseg.d[r], sm)) {
			for r < lseg.size {
				lseg.Push(r)
				r = 2*r + 1
				if cmp(lseg.merger(lseg.d[r], sm)) {
					sm = lseg.merger(lseg.d[r], sm)
					r--
				}
			}
			return r + 1 - lseg.size
		}
		sm = lseg.merger(lseg.d[r], sm)
		if r&-r == r {
			break
		}
	}
	return 0
}
func (lseg *LazySegtree) ceilPow2(n int) int {
	x := 0
	for (1 << uint(x)) < n {
		x++
	}
	return x
}

/*
  セグメント木(2020.05.24作成)
	SegtreeInitで初期化
	Setで値設定し、Updateで木作成
	Getで値を取得
	UpdateAtで個別のアイテムを更新
	Queryで区間の値を取得
	compareで比較方法変更可能
*/

// Data :
// Data型をstructすれば複数データが持てる
// compareも変更すること！
type Data int

// SegmentTree :
type SegmentTree struct {
	inf    Data
	d      []Data
	offset int
}

// SegtreeInit :　nが要素数、valが初期値
func SegtreeInit(n int, val Data) *SegmentTree {
	var ret SegmentTree
	size := 1
	for size < n {
		size *= 2
	}
	ret.d = make([]Data, size*2)
	for i := 1; i < size*2; i++ {
		ret.d[i] = val
	}
	ret.offset = size
	ret.inf = val
	return &ret
}

// Set : 要素に値をセット（※木は更新されない）
func (s *SegmentTree) Set(idx int, val Data) {
	s.d[s.offset+idx] = val
}

// Get : 要素に値を取得
func (s *SegmentTree) Get(idx int) Data {
	return s.d[s.offset+idx]
}

// Update :
func (s *SegmentTree) Update() {
	N := s.offset
	off := s.offset

	for N > 1 {
		for i := off; i < off+N; i += 2 {
			p := i / 2
			l := i
			r := i + 1
			s.d[p] = s.compare(s.d[l], s.d[r])
		}
		off /= 2
		N /= 2
	}
}

// querySub :
// a, b ... 範囲
func (s *SegmentTree) querySub(a, b, k, l, r int) Data {
	if r <= a || b <= l {
		return s.inf
	}
	if a <= l && r <= b {
		return s.d[k]
	}
	return s.compare(
		s.querySub(a, b, k*2, l, (l+r)/2),
		s.querySub(a, b, k*2+1, (l+r)/2, r))
}

// Query :
// a, b ... 範囲 a <= x < bの範囲で検索
// [a, b)となっているのに注意
func (s *SegmentTree) Query(a, b int) Data {
	return s.querySub(a, b, 1, 0, s.offset)
}

// UpdateAt :
func (s *SegmentTree) UpdateAt(n int, val Data) {
	pos := s.offset + n
	s.d[pos] = val
	for pos > 1 {
		p := pos / 2
		l := p * 2
		r := p*2 + 1
		s.d[p] = s.compare(s.d[l], s.d[r])
		pos /= 2
	}
}

// compare :
// 比較関数（ここで比較方法を設定）
// ※min,maxを入れ替えるときなどは、Initの設定注意
func (s *SegmentTree) compare(l, r Data) Data {
	// 区間の合計の場合はinitを0にして下記
	return l + r

	// 区間のminの場合はinfに最大値以上を設定して下記
	// if l < r {
	// 	return l
	// }
	// return r
}