local mfl, mce, mmi = math.floor, math.ceil, math.min
local mma = math.max
local LazySegTree = {}

LazySegTree.create = function(self, n, func, emptyvalue)
  self.func, self.emptyvalue = func, emptyvalue
  local stagenum, mul = 1, 1
  self.cnt, self.size = {1}, {}
  self.lazy = {{emptyvalue}}
  while mul < n do
    mul, stagenum = mul * 2, stagenum + 1
    self.cnt[stagenum] = mul
    self.lazy[stagenum] = {}
    for i = 1, mul do self.lazy[stagenum][i] = emptyvalue end
  end
  for i = 1, stagenum do self.size[i] = self.cnt[stagenum + 1 - i] end
  self.stagenum = stagenum
end
LazySegTree.getValue = function(self, idx)
  for stage = 1, self.stagenum - 1 do
    local pos = mce(idx / (self.size[stage]))
    local v = self.lazy[stage][pos]
    if v ~= self.emptyvalue then
      self.lazy[stage + 1][pos * 2 - 1] = self.lazy[stage + 1][pos * 2 - 1] + v
      self.lazy[stage + 1][pos * 2] = self.lazy[stage + 1][pos * 2] + v
    end
    self.lazy[stage][pos] = self.emptyvalue
  end
  return self.lazy[self.stagenum][idx]
end
LazySegTree.addRange = function(self, left, right, value)
  if left == right then self.lazy[self.stagenum][left] = self.lazy[self.stagenum][left] + value return end
  local start_stage = 1
  while right - left + 1 < self.size[start_stage] do
    start_stage = start_stage + 1
  end
  local t1, t2, t3 = {start_stage}, {left}, {right}
  while 0 < #t1 do
    local stage, l, r = t1[#t1], t2[#t1], t3[#t1]
    table.remove(t1) table.remove(t2) table.remove(t3)
    local sz = self.size[stage]
    if (l - 1) % sz ~= 0 then
      local newr = mmi(r, mce((l - 1) / sz) * sz)
      table.insert(t1, stage + 1) table.insert(t2, l) table.insert(t3, newr)
      l = newr + 1
    end
    if sz <= r + 1 - l then
      self.lazy[stage][mce(l / sz)] = self.lazy[stage][mce(l / sz)] + value
      l = l + sz
    end
    if l <= r then
      table.insert(t1, stage + 1) table.insert(t2, l) table.insert(t3, r)
    end
  end
end
LazySegTree.new = function(n, func, emptyvalue)
  local obj = {}
  setmetatable(obj, {__index = LazySegTree})
  obj:create(n, func, emptyvalue)
  return obj
end

local SegTree = {}
SegTree.updateAll = function(self)
  for i = self.stagenum - 1, 1, -1 do
    for j = 1, self.cnt[i] do
      self.stage[i][j] = self.func(self.stage[i + 1][j * 2 - 1], self.stage[i + 1][j * 2])
    end
  end
end
SegTree.create = function(self, n, func, emptyvalue)
  self.func, self.emptyvalue = func, emptyvalue
  local stagenum, mul = 1, 1
  self.cnt, self.stage, self.size = {1}, {{}}, {}
  while mul < n do
    mul, stagenum = mul * 2, stagenum + 1
    self.cnt[stagenum], self.stage[stagenum] = mul, {}
  end
  for i = 1, stagenum do self.size[i] = self.cnt[stagenum + 1 - i] end
  self.stagenum = stagenum
  for i = 1, mul do self.stage[stagenum][i] = emptyvalue end
  self:updateAll()
end
SegTree.getRange = function(self, left, right)
  if left == right then return self.stage[self.stagenum][left] end
  local start_stage = 1
  while right - left + 1 < self.size[start_stage] do
    start_stage = start_stage + 1
  end
  local ret = self.emptyvalue
  local t1, t2, t3 = {start_stage}, {left}, {right}
  while 0 < #t1 do
    local stage, l, r = t1[#t1], t2[#t1], t3[#t1]
    table.remove(t1) table.remove(t2) table.remove(t3)
    local sz = self.size[stage]
    if (l - 1) % sz ~= 0 then
      local newr = mmi(r, mce((l - 1) / sz) * sz)
      table.insert(t1, stage + 1) table.insert(t2, l) table.insert(t3, newr)
      l = newr + 1
    end
    if sz <= r + 1 - l then
      ret = self.func(ret, self.stage[stage][mce(l / sz)])
      l = l + sz
    end
    if l <= r then
      table.insert(t1, stage + 1) table.insert(t2, l) table.insert(t3, r)
    end
  end
  return ret
end
SegTree.setValue = function(self, idx, value)
  self.stage[self.stagenum][idx] = value
  for i = self.stagenum - 1, 1, -1 do
    local dst = mce(idx / 2)
    local rem = dst * 4 - 1 - idx
    self.stage[i][dst] = self.func(self.stage[i + 1][idx], self.stage[i + 1][rem])
    idx = dst
  end
end
SegTree.new = function(n, func, emptyvalue)
  local obj = {}
  setmetatable(obj, {__index = SegTree})
  obj:create(n, func, emptyvalue)
  return obj
end

local n, q = io.read("*n", "*n")
local lst = LazySegTree.new(n, function(a, b) return a + b end, 0)
local st = SegTree.new(n, function(a, b) return a + b end, 0)
local prv = 0
for i = 1, n do
  local a = io.read("*n")
  lst:addRange(i, i, a)
  if 1 < i then
    if a ~= prv then
      st:setValue(i, 1)
    end
    prv = a
  end
end
for iq = 1, q do
  local z = io.read("*n")
  if z == 1 then
    local l, r, x = io.read("*n", "*n", "*n")
    lst:addRange(l, r, x)
    if 1 < l then
      local val_lm1 = lst:getValue(l - 1)
      local val_l = lst:getValue(l)
      st:setValue(l, val_l ~= val_lm1 and 1 or 0)
    end
    if r < n then
      local val_rp1 = lst:getValue(r + 1)
      local val_r = lst:getValue(r)
      st:setValue(r + 1, val_r ~= val_rp1 and 1 or 0)
    end
  else
    local l, r = io.read("*n", "*n")
    local v = st:getRange(l, r)
    if st:getRange(l, l) == 0 then v = v + 1 end
    print(v)
  end
end