n = int(input())
s, t = map(int, input().split())
s, t = s-1, t-1
a = list(map(int, input().split()))
cum = [0]
for x in a:
	cum.append(cum[-1] + x)
S = cum[-1]
ans = -10**20
for l in range(n):
	r = l + (n-1)//2
	#print(l, r)
	if not (l <= s <= r or s <= r%n <= l):
		continue
	if (l <= t <= r or t <= r%n <= l):
		continue
	#print(l, r)
	if r < n:
		ans = max(ans, 2 * cum[r+1] - 2 * cum[l] - S)
	else:
		r %= n
		ans = max(ans, S - 2 * cum[l] + 2 * cum[r+1])
print(ans)