import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
s,t=map(int,input().split())
A=[int(i) for i in input().split()]
sign=1
if s>t:
	s,t=t,s
	sign=-1

a,b=t-s-1,n-(t-s+1)
ans=0
s-=1
t-=1
if a%2==0 or b%2==0:
	for i in range(n):
		if i<=s:
			if s-i<=i+n-t:
				ans+=A[i]
			else:
				ans-=A[i]
		elif i<=t:
			if i-s<=t-i:
				ans+=A[i]
			else:
				ans-=A[i]
		else:
			if n+s-i<=i-t:
				ans+=A[i]
			else:
				ans-=A[i]
	print(sign*ans)
else:
	dif=0
	for i in range(n):
		if i<=s:
			if s-i<i+n-t:
				ans+=A[i]
			elif s-i==i+n-t:
				dif+=A[i]
			else:
				ans-=A[i]
		elif i<=t:
			if i-s<t-i:
				ans+=A[i]
			elif i-s==t-i:
				dif-=A[i]
			else:
				ans-=A[i]
		else:
			if n+s-i<i-t:
				ans+=A[i]
			elif n+s-i==i-t:
				dif+=A[i]
			else:
				ans-=A[i]
	if sign==1:
		if dif>=0:
			print(ans+dif)
		else:
			print(ans-dif)
	else:
		if dif>=0:
			print(-ans+dif)
		else:
			print(-ans-dif)