import sequtils,strutils
type
    binaryIndexTree[I:static[int]] = array[I + 1,int64] 

proc add(BIT :var binaryIndexTree,i : int64, a : int64)=
    var index = i
    while BIT[0] >= index:
        BIT[index] += a
        index += ((index xor (index - 1)) and index)

proc sum(BIT : binaryIndexTree, i : int64):int64 =
    var index = i
    while index > 0:
        result += BIT[index]
        index = (index and (index - 1))

proc initBit(i : static[int]) : binaryIndexTree[i] =
    var res : binaryIndexTree[i]
    res[0] = i
    return res

var
    N, Q : int64
(N, Q) = stdin.readline.split.map(parseBiggestInt)
var
    BIT = initBit(100010)
    A = stdin.readline.split.map(parseBiggestInt)
    S : array[100010, int64]

for i, a in A:
    if i == 0:
        continue
    S[i] = a - A[i - 1]
    if S[i] != 0:
        BIT.add(i, 1)

for q in 1..Q:
    var L = stdin.readline.split.map(parseBiggestInt)
    var
        l = L[1]
        r = L[2]
    if L[0] == 1:
        var x = L[3]
        S[l - 1] += x
        S[r] -= x
        if l > 2 and S[l - 1] == 0:
            BIT.add(l - 1, -1)
        elif l > 2 and S[l - 1] == x:
            BIT.add(l - 1, 1)
        if S[r] == 0:
            BIT.add(r, -1)
        elif S[r] == -x:
            BIT.add(r, 1)
    else:
        echo BIT.sum(r - 1) - BIT.sum(l - 1) + 1