using System;
using System.Collections.Generic;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.IO;
using System.Reflection;
using static System.Math;
using System.Numerics;
static class Program{
	const int mod=(int)1e9+7;
	static void Main(){
		Sc sc=new Sc();
		var s=sc.Ia;
		var a=sc.Ia3(0);
		St st=new St(a);
		StringBuilder sb=new StringBuilder();
		for(int i = 0;i<s[1];i++) {
			var e=sc.Ia;
			if(e[0]==1){st.Ud2(e[1],e[2],e[3]);}
			else{sb.Append(st.Get(e[1],e[2]).d1+"\n");}
		}
		Console.Write(sb);
	}
}
public class Dt{
	public static int e=0;
	public int d1;
	public long c1,l,r;
	static Dt(){}
	public Dt(bool b){d1=e;c1=0;}
	public Dt(int d1,long l,long r){
		this.d1=d1;
		this.l=l;
		this.r=r;
		c1=0;
	}
	public Dt(Dt e){d1=e.d1;c1=0;}
	public static Dt Um(Dt a,long n){
		a.l+=n;
		a.r+=n;
		return a;
	}
	public static Dt Dm(Dt a,long n){
		a.c1+=n;
		return a;
	}
	public static Dt Cm(Dt a,Dt b){
		if(b.d1==0){return a;}
		if(a.d1==0){return b;}
		var e=new Dt(a.d1+b.d1,a.l,b.r);
		if(a.r==b.l){e.d1--;}
		return e;
	}
	public static bool operator==(Dt a,Dt b){return a.d1==b.d1;}
	public static bool operator!=(Dt a,Dt b){return a.d1!=b.d1;}
	public override bool Equals(object obj){return false;}
	public override int GetHashCode(){return 0;}
}
public class St{
	public Dt[] dat;
	private int m=1,cnt;
	private Dt du;
	public St(int n){
		du=new Dt(true);
		while(m<n){m<<=1;}
		m--;
		cnt=m+n;
		dat=new Dt[cnt+1];
		dat[cnt]=du;
		for(int i=cnt-1;i>=m;i--){dat[i]=new Dt(true);}
		for(int i=m-1;i>=0;i--){dat[i]=(i<<1)+1<m+n?dat[(i<<1)+1]:du;}
	}
	public St(int[] a){
		int n=a.Length;
		du=new Dt(true);
		while(m<n){m<<=1;}
		m--;
		cnt=m+n;
		dat=new Dt[cnt+1];
		dat[cnt]=du;
		for(int i=cnt-1;i>=m;i--){dat[i]=new Dt(1,a[i-m],a[i-m]);}
		for(int i=m-1;i>=0;i--){
			if((i<<1)+2<cnt){dat[i]=Dt.Cm(dat[(i<<1)+1],dat[(i<<1)+2]);}
			else if((i<<1)+1<m+n){dat[i]=dat[(i<<1)+1];}
			else{dat[i]=du;}
		}
	}
	public void Ud(int q,long b1){
		q+=m;
		dat[q]=Dt.Um(dat[q],b1);
		q=(q-1)>>1;
		while(q>=0){
			Dt o=Dt.Cm(dat[(q<<1)+1],dat[(q<<1)+2]);
			if(dat[q]==o){break;}
			dat[q]=o;
			q=(q-1)>>1;
		}
	}
	private Dt Fdg(int a,int b,int k,int l,int r){
		if(dat[k].c1!=0){Fde(k,Dt.e);}
		if(r<a||b<l){return du;}
		if(a<=l&&r<=b){return dat[k];}
		Dt p=Fdg(a,b,k*2+1,l,(l+r)>>1);
		Dt q=Fdg(a,b,k*2+2,(l+r+1)>>1,r);
		return Dt.Cm(p,q);
	}
	public Dt Get(int a,int b){return a>b?du:Fdg(a,b,0,0,m);}
	public void Ud2(int a,int b,long d){Hn(a,b,0,0,m,d);}
	private void Hn(int a,int b,int k,int l,int r,long d){
		if(a<=l&&r<=b){Fde(k,d);return;}
		else if(dat[k].c1!=0){Fde(k,Dt.e);}
		if(r>=a&&b>=l){
			Hn(a,b,k*2+1,l,(l+r)>>1,d);
			Hn(a,b,k*2+2,(l+r+1)>>1,r,d);
			dat[k]=Dt.Cm(dat[(k<<1)+1],dat[(k<<1)+2]);
		}
	}
	private void Fde(int k,long d){
		dat[k]=Dt.Dm(dat[k],d);
		dat[k]=Dt.Um(dat[k],dat[k].c1);
		if((k<<1)+2<=cnt){dat[(k<<1)+1]=Dt.Dm(dat[(k<<1)+1],dat[k].c1);}
		if((k<<1)+2<cnt){dat[(k<<1)+2]=Dt.Dm(dat[(k<<1)+2],dat[k].c1);}
		dat[k].c1=Dt.e;
	}
}
public class Sc{
	public int I{get{return int.Parse(Console.ReadLine());}}
	public long L{get{return long.Parse(Console.ReadLine());}}
	public double D{get{return double.Parse(Console.ReadLine());}}
	public string S{get{return Console.ReadLine();}}
	public int[] Ia{get{return Array.ConvertAll(Console.ReadLine().Split(),int.Parse);}}
	public long[] La{get{return Array.ConvertAll(Console.ReadLine().Split(),long.Parse);}}
	public double[] Da{get{return Array.ConvertAll(Console.ReadLine().Split(),double.Parse);}}
	public string[] Sa{get{return Console.ReadLine().Split();}}
	public object[] Oa{get{return Console.ReadLine().Split();}}
	public int[] Ia2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),int.Parse);}}
	public int[] Ia3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),int.Parse);}
	public int[] Ia3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),long.Parse);}
	public long[] La3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(int a){return Array.ConvertAll((a.ToString()+" "+Console.ReadLine()).Split(),double.Parse);}
	public double[] Da3(bool a,int b,bool c,int d){return Array.ConvertAll(((a?b.ToString()+" ":"")+Console.ReadLine()+(c?" "+d.ToString():"")).Split(),double.Parse);}
	public T[] Arr<T>(int n,Func<T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f();}return a;}
	public T[] Arr<T>(int n,Func<int,T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i);}return a;}
	public T[] Arr<T>(int n,Func<string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(Console.ReadLine().Split());}return a;}
	public T[] Arr<T>(int n,Func<int,string[],T> f){var a=new T[n];for(int i=0;i<n;i++){a[i]=f(i,Console.ReadLine().Split());}return a;}
}