#include <iostream>
#include <string>
#include <vector>
#include <deque>
#include <queue>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#define vv(a, b, c, d) vector<vector<d> >(a, vector<d>(b, c))
#define vvi std::vector<std::vector<int> >
#define vvl std::vector<std::vector<ll> >
#define MODs 1000000007;
typedef long long int ll;
using namespace std;
//-------------------------------------------------------------------
ll M=1;
vector<ll> seg, ad;
void init(ll N){
  while(M<N) M*=2;
  M=M*2-1;
  for(int i=0;i<M;i++) {
    seg.push_back(0);
    ad.push_back(0);
  }
}
void update(ll l, ll r, ll x, ll k){
  k+=(M+1)/2-1;
  seg[k] = x;
  while(k>0){
    k = (k-1)/2;
    seg[k] = seg[k*2+1] + seg[k*2+2];
  }
}
void add(ll a, ll b, ll l, ll r, ll x, ll k){
  if(r<=a||b<=l) return;
  if(a<=l&&r<=b) ad[k]+=x;
  else{
    add(a, b, l, (l+r)/2, x, k*2+1);
    add(a, b, (l+r)/2, r, x, k*2+2);
  }
}
ll get_add(ll k){
  k+=(M+1)/2-1;
  ll ret = ad[k];
  while(k>0){
    k = (k-1)/2;
    ret += ad[k];
  }
  return ret;
}
ll query(ll a, ll b, ll l, ll r, ll k){
  if(r<=a || b<=l) return 0;
  if(a<=l && r<=b) return seg[k];
  ll A = query(a, b, l, (l+r)/2, k*2+1);
  ll B = query(a, b, (l+r)/2, r, k*2+2);
  return A + B;
}
//-------------------------------------------------------------------

int main(int argc, char const *argv[]) {
  ll N, Q, a, b, c, d;
  std::cin >> N >> Q;
  init(N);
  std::vector<ll> A(N);
  for(int i=0;i<N;i++)  std::cin >> A[i];
  for(int i=0;i<N-1;i++) if(A[i]!=A[i+1]) update(0, (M+1)/2, 1, i);

  for(int i=0;i<Q;i++){
    std::cin >> a;
    if(a == 2) {
      std::cin >> b >> c;
      if(b!=c){
        std::cout << query(b-1, c-1, 0, (M+1)/2, 0) + 1<< '\n';
      }else std::cout << 1 << '\n';
    }else {
      std::cin >> b >> c >> d;
      add(b-1, c, 0, (M+1)/2, d, 0);
      if(b-1!=0&&get_add(b-2)+A[b-2]!=get_add(b-1)+A[b-1]) update(0, (M+1)/2, 1, b-2);
      else update(0, (M+1)/2, 0, b-2);
      if(c-1!=N-1&&get_add(c-1)+A[c-1]!=get_add(c)+A[c]) update(0, (M+1)/2, 1, c-1);
      else update(0, (M+1)/2, 0, c-1);
    }
  }
  return 0;
}