N = int(input())
s, t = (int(x) - 1 for x in input().split())
A = [int(x) for x in input().split()]

left = []
i = (s + 1) % N
while i != t:
    left.append(A[i])
    i = (i + 1) % N
right = []
i = (s - 1) % N
while i != t:
    right.append(A[i])
    i = (i - 1) % N

if len(left) % 2 == len(right) % 2 == 1:
    op1 = sum(left[:(len(left) + 1) // 2]) + sum(right[:len(right) // 2]) - sum(left[(len(left) + 1) // 2:]) - sum(right[len(right) // 2:])
    op2 = sum(left[:len(left) // 2]) + sum(right[:(len(right) + 1) // 2]) - sum(left[len(left) // 2:]) - sum(right[(len(right) + 1) // 2:])
    print(max(op1, op2) + A[s] - A[t])
else:
    first = A[s] + sum(left[:(len(left) + 1) // 2]) + sum(right[:(len(right) + 1) // 2])
    second = A[t] + sum(left[(len(left) + 1) // 2:]) + sum(right[(len(right) + 1) // 2:])
    print(first - second)