def solve(io)
  n, q = io.get2
  a = io.get_a(n, Int64)

  s = SegTree.new(a.map { |ai| Item.new(ai, ai, 1) }, Item.new(-1, -1, 0))
  q.times do
    case io.get
    when 1
      l, r, x = io.get(Int32, Int32, Int64); l -= 1; r -= 1
      s.apply(l..r, SegTree::OpAdd.new(x))
    when 2
      l, r = io.get2; l -= 1; r -= 1
      io.put s[l..r].b
    end
  end
end

record Item, l : Int64, r : Int64, b : Int32

class ProconIO
  def initialize(@ins : IO = STDIN, @outs : IO = STDOUT)
    @buf = IO::Memory.new("")
  end

  def get(k : T.class = Int32) forall T
    get_v(k)
  end

  macro define_get
    {% for i in (2..9) %}
      def get({{ *(1..i).map { |j| "k#{j}".id } }})
        { {{ *(1..i).map { |j| "get(k#{j})".id } }} }
      end
    {% end %}
  end
  define_get

  macro define_getn
    {% for i in (2..9) %}
      def get{{i}}(k : T.class = Int32) forall T
        get({{ *(1..i).map { "k".id } }})
      end
    {% end %}
  end
  define_getn

  def get_a(n : Int, k : T.class = Int32) forall T
    Array.new(n) { get_v(k) }
  end

  def get_c(n : Int, k : T.class = Int32) forall T
    get_a(n, k)
  end

  macro define_get_c
    {% for i in (2..9) %}
      def get_c(n : Int, {{ *(1..i).map { |j| "k#{j}".id } }})
        a = Array.new(n) { get({{ *(1..i).map { |j| "k#{j}".id } }}) }
        { {{ *(1..i).map { |j| "a.map { |e| e[#{j-1}] }".id } }} }
      end
    {% end %}
  end
  define_get_c

  macro define_getn_c
    {% for i in (2..9) %}
      def get{{i}}_c(n : Int, k : T.class = Int32) forall T
        get_c(n, {{ *(1..i).map { "k".id } }})
      end
    {% end %}
  end
  define_getn_c

  def get_m(r : Int, c : Int, k : T.class = Int32) forall T
    Array.new(r) { get_a(c, k) }
  end

  macro define_put
    {% for i in (1..9) %}
      def put({{ *(1..i).map { |j| "v#{j}".id } }}, *, delimiter = " ")
        {% for j in (1..i) %}
          print_v(v{{j}}, delimiter)
          {% if j < i %}@outs << delimiter{% end %}
        {% end %}
        @outs.puts
      end
    {% end %}
  end
  define_put

  def put_e(*vs)
    put(*vs)
    exit
  end

  def put_f(*vs)
    put(*vs)
    @outs.flush
  end


  private def get_v(k : Int32.class); get_token.to_i32; end
  private def get_v(k : Int64.class); get_token.to_i64; end
  private def get_v(k : UInt32.class); get_token.to_u32; end
  private def get_v(k : UInt64.class); get_token.to_u64; end
  private def get_v(k : Float64.class); get_token.to_f64; end
  private def get_v(k : String.class); get_token; end

  private def get_token
    loop do
      token = @buf.gets(' ', chomp: true)
      break token unless token.nil?
      @buf = IO::Memory.new(@ins.read_line)
    end
  end

  private def print_v(v, dlimiter)
    @outs << v
  end

  private def print_v(v : Enumerable, delimiter)
    v.each_with_index do |e, i|
      @outs << e
      @outs << delimiter if i < v.size - 1
    end
  end
end

struct Int
  def cdiv(b : Int)
    (self + b - 1) // b
  end

  def bit?(i : Int)
    bit(i) == 1
  end

  def set_bit(i : Int)
    self | (self.class.new(1) << i)
  end

  def reset_bit(i : Int)
    self & ~(self.class.new(1) << i)
  end

  {% if compare_versions(env("CRYSTAL_VERSION") || "0.0.0", "0.34.0") < 0 %}
    def bit_length : Int32
      x = self < 0 ? ~self : self

      if x.is_a?(Int::Primitive)
        Int32.new(sizeof(self) * 8 - x.leading_zeros_count)
      else
        to_s(2).size
      end
    end
  {% end %}
end

struct Float64
  def near_zero?
    self.abs < EPSILON
  end
end

struct Number
  {% if compare_versions(env("CRYSTAL_VERSION") || "0.0.0", "1.1.0") < 0 %}
    def zero?
      self == 0
    end

    def positive?
      self > 0
    end

    def negative?
      self < 0
    end
  {% end %}

  {% if compare_versions(env("CRYSTAL_VERSION") || "0.0.0", "0.36.0") < 0 %}
    def self.additive_identity
      zero
    end

    def self.multiplicative_identity
      new(1)
    end
  {% end %}
end

class Array
  macro new_md(*args, &block)
    {% if !block %}
      {% for arg, i in args[0...-2] %}
        Array.new({{arg}}) {
      {% end %}
      Array.new({{args[-2]}}, {{args[-1]}})
      {% for arg in args[0...-2] %}
        }
      {% end %}
    {% else %}
      {% for arg, i in args %}
        Array.new({{arg}}) { |_i{{i}}|
      {% end %}
      {% for block_arg, i in block.args %}
        {{block_arg}} = _i{{i}}
      {% end %}
      {{block.body}}
      {% for arg in args %}
        }
      {% end %}
    {% end %}
  end
end

module Math
  {% if compare_versions(env("CRYSTAL_VERSION") || "0.0.0", "1.2.0") < 0 %}
    def isqrt(value : Int::Primitive)
      raise ArgumentError.new "Input must be non-negative integer" if value < 0
      return value if value < 2
      res = value.class.zero
      bit = res.succ << (res.leading_zeros_count - 2)
      bit >>= value.leading_zeros_count & ~0x3
      while (bit != 0)
        if value >= res + bit
          value -= res + bit
          res = (res >> 1) + bit
        else
          res >>= 1
        end
        bit >>= 2
      end
      res
    end
  {% end %}
end

macro min_u(a, b)
  {{a}} = Math.min({{a}}, {{b}})
end

macro max_u(a, b)
  {{a}} = Math.max({{a}}, {{b}})
end

macro zip(a, *b, &block)
  {{a}}.zip({{*b}}) {{block}}
end

abstract class SegmentTreeLazy(T)
  abstract class Op; end
  class OpNil < Op; end

  def initialize(@n : Int32, @init : T = T.zero)
    @an = 1 << (@n - 1).bit_length
    @sec = Array.new(@an << 1) { Section(T).new(@init) }
    init_propagate
  end

  def initialize(b : Array(T), @init : T = T.zero)
    @n = b.size
    @an = 1 << (@n - 1).bit_length
    @sec = Array.new(@an << 1) { Section(T).new(@init) }
    b.each_with_index do |bi, i|
      @sec[i + @an].val = bi
    end
    init_propagate
  end

  def compose(a : T, b : T) : T; @init; end

  def update_section(sec : Section, op : Op, s : Int) : NoReturn; end

  def [](start : Int, count : Int)
    l, r = start, start + count
    summary(l, r, 1, 0, @an)
  end

  def [](r : Range)
    sc = Indexable.range_to_index_and_count(r, @n)
    raise ArgumentError.new("Invalid range") if sc.nil?
    self[*sc]
  end

  def apply(r : Range, op : Op)
    sc = Indexable.range_to_index_and_count(r, @n)
    raise ArgumentError.new("Invalid range") if sc.nil?
    start, count = sc
    l, r = start, start + count
    apply(op, l, r, 1, 0, @an)
  end

  class Section(T)
    def initialize(@val : T)
      @op = OpNil.new
    end

    property val : T

    property op : Op
  end


  @an : Int32
  @sec : Array(Section(T))

  private def init_propagate
    (1...@an).reverse_each do |i|
      @sec[i].val = compose(@sec[i << 1].val, @sec[i << 1 | 1].val)
    end
  end

  private def summary(l : Int, r : Int, k : Int, nl : Int, nr : Int)
    return @init if nr <= l || r <= nl
    return @sec[k].val if l <= nl && nr <= r

    propagate(k, nl, nr)

    nm = (nl + nr) >> 1
    vl = summary(l, r, k << 1    , nl, nm)
    vr = summary(l, r, k << 1 | 1, nm, nr)

    compose(vl, vr)
  end

  private def propagate(k : Int, nl : Int, nr : Int)
    return if @sec[k].op.is_a? OpNil

    nm = (nl + nr) >> 1
    update_section(@sec[k << 1    ], @sec[k].op, nm - nl)
    update_section(@sec[k << 1 | 1], @sec[k].op, nr - nm)

    @sec[k].op = OpNil.new
  end

  private def apply(op : Op, l : Int, r : Int, k : Int, nl : Int, nr : Int)
    return if nr <= l || r <= nl

    if l <= nl && nr <= r
      update_section(@sec[k], op, nr - nl)
      return
    end

    propagate(k, nl, nr)

    nm = (nl + nr) >> 1
    apply(op, l, r, k << 1    , nl, nm)
    apply(op, l, r, k << 1 | 1, nm, nr)

    @sec[k].val = compose(@sec[k << 1].val, @sec[k << 1 | 1].val)
  end
end

class SegTree < SegmentTreeLazy(Item)
  class OpAdd < Op
    def initialize(@val : Int64); end
    getter val : Int64
  end

  def compose(a : Item, b : Item)
    if b.l == -1
      a
    elsif a.l == -1
      b
    else
      Item.new(a.l, b.r, a.b + b.b - (a.r == b.l ? 1 : 0))
    end
  end

  def update_section(sec : Section(Item), op : Op, s : Int) forall U
    return if sec.val.l == -1
    case op
    when OpAdd
      sec.val = Item.new(sec.val.l + op.val, sec.val.r + op.val, sec.val.b)
      sec.op = case prev = sec.op
               when OpAdd
                 OpAdd.new(prev.val + op.val)
               else
                 op
               end
    end
  end
end

solve(ProconIO.new)