package main

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

func getScanner(fp *os.File) *bufio.Scanner {
	scanner := bufio.NewScanner(fp)
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 500001), 500000)
	return scanner
}

func getNextString(scanner *bufio.Scanner) string {
	scanner.Scan()
	return scanner.Text()
}

func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}

func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}

func getNextUint64(scanner *bufio.Scanner) uint64 {
	i, _ := strconv.ParseUint(getNextString(scanner), 10, 64)
	return i
}

func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}

func main() {
	fp := os.Stdin
	wfp := os.Stdout

	if len(os.Args) > 1 {
		fp, _ = os.Open(os.Args[1])
		if len(os.Args) > 2 {
			wfp, _ = os.Create(os.Args[2])
		}
	}

	scanner := getScanner(fp)
	writer := bufio.NewWriter(wfp)

	n := getNextInt(scanner)
	q := getNextInt(scanner)

	seg := Segment{}
	seg.init(n)

	for i := 0; i < n; i++ {
		seg.bucket[0][i] = getNextInt(scanner)
	}

	for i := 0; i < q; i++ {
		t := getNextInt(scanner)
		l := getNextInt(scanner) - 1
		r := getNextInt(scanner) - 1
		if t == 1 {
			seg.rangeAdd(l, r+1, getNextInt(scanner))
			continue
		}
		fmt.Fprintln(writer, seg.f(l, r))
	}
	writer.Flush()
}

// Segment ...
type Segment struct {
	n, h, i, chunk, inf int
	unit                []int
	bucket              [][]int
}

func (seg *Segment) init(n int) {
	seg.n = n
	seg.unit = make([]int, 1)
	seg.unit[0] = 1
	seg.bucket = make([][]int, 1)
	seg.bucket[0] = make([]int, n)

	chunk := 8
	for i := 0; n > 1; i++ {
		n = (n-1)/chunk + 1
		seg.bucket = append(seg.bucket, make([]int, n))
		seg.unit = append(seg.unit, seg.unit[i]*chunk)
	}
	seg.h = len(seg.unit)
	seg.chunk = chunk
	seg.inf = math.MaxInt32
}

func (seg *Segment) get(index int) int {
	value := 0
	for seg.i = 0; seg.i < seg.h; seg.i++ {
		value += seg.bucket[seg.i][index/seg.unit[seg.i]]
		index /= seg.unit[seg.i]
	}
	return value
}

func (seg *Segment) rangeAdd(l, r, value int) {
	for index := l; index < r; index += seg.unit[seg.i] {
		for seg.i = 0; seg.i < seg.h-1 && index%seg.unit[seg.i+1] == 0; seg.i++ {
			if index+seg.unit[seg.i+1] >= r {
				break
			}
		}
		seg.bucket[seg.i][index/seg.unit[seg.i]] += value
	}
}

func (seg *Segment) f(l, r int) int {
	if l == r {
		return 1
	}
	return seg.g(seg.get(l), seg.get(l+1)) + seg.f(l+1, r)
}

func (seg *Segment) g(x, y int) int {
	if x == y {
		return 0
	}
	return 1
}