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;
	const double eps=1e-11;
	static void Main(){
		Sc sc=new Sc();
		var n=sc.I;
		var t=sc.Ia;
		t[0]--;
		t[1]--;
		var a=sc.Ia;
		var li1=new List<int>();
		var li2=new List<int>();
		long ans=a[t[0]]-a[t[1]];
		for(int i = t[0]+1;i%n!=t[1];i++) {li1.Add(a[i%n]);}
		for(int i = n+t[0]-1;i%n!=t[1];i--) {li2.Add(a[i%n]);}
		if(li1.Count%2==1&&li2.Count%2==1){
			ans+=Max(li1[li1.Count>>1],li2[li2.Count>>1]);
			ans-=Min(li1[li1.Count>>1],li2[li2.Count>>1]);
			for(int i = 0;i<li1.Count;i++) {
				if(i==li1.Count>>1){continue;}
				ans+=(i<li1.Count>>1?1:-1)*li1[i];
			}
			for(int i = 0;i<li2.Count;i++) {
				if(i==li2.Count>>1){continue;}
				ans+=(i<li2.Count>>1?1:-1)*li2[i];
			}
		}
		else{
			for(int i = 0;i<li1.Count;i++) {
				ans+=(i<(li1.Count+1)>>1?1:-1)*li1[i];
			}
			for(int i = 0;i<li2.Count;i++) {
				ans+=(i<(li2.Count+1)>>1?1:-1)*li2[i];
			}
		}
		Console.WriteLine("{0}",ans);
	}
}

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(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),int.Parse);}
	public int[] Ia3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),int.Parse);}
	public long[] La2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),long.Parse);}}
	public long[] La3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).Split(),long.Parse);}
	public long[] La3(int a){return Array.ConvertAll((Console.ReadLine()+" "+a.ToString()).Split(),long.Parse);}
	public double[] Da2{get{return Array.ConvertAll(("0 "+Console.ReadLine()+" 0").Split(),double.Parse);}}
	public double[] Da3(string a,string b){return Array.ConvertAll((a+Console.ReadLine()+b).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;}
}