n,q=map(int,input().split())
a=list(map(int,input().split()))

B=317
st1=[0]*B*B
st2=[0]*B

for i in range(n-1):
  st1[i]=a[i+1]-a[i]
for i in range(B):
  st2[i]=st1[i*B:i*B+B].count(0)

for _ in range(q):
  t,*que,=map(int,input().split())
  if t==1:
    l,r,x=que
    l-=1
    r-=1
    if l-1>=0:
      st1[l-1]+=x
      y=(l-1)//B
      st2[y]=st1[y*B:y*B+B].count(0)
    st1[r]-=x
    y=r//B
    st2[y]=st1[y*B:y*B+B].count(0)
  if t==2:
    l,r=que
    l-=1
    r-=1
    r-=1
    a=0
    yl=l//B
    yr=r//B
    if yl==yr:
      a+=st1[l:r+1].count(0)
    else:
      a+=st1[l:yl*B+B].count(0)
      a+=st1[yr*B:r+1].count(0)
      a+=sum(st2[yl+1:yr])
    print(r-l+1-a+1)