import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


def debug(*arg, sep=" ", end="\n"):
    print(*arg, sep=sep, end=end, file=sys.stderr)


N = int(input())
S, T = map(int, input().split())
A = list(map(int, input().split()))

get = (N + 1) // 2

acc = [0] * (N + N + 1)
for i, a in enumerate(A, 1):
    acc[i] = acc[i-1] + a
for i, a in enumerate(A, N + 1):
    acc[i] = acc[i-1] + a

if S < T:
    S += N

dL = S - T - 1
dR = T + N - S - 1
debug(dL, dR)

ans = - 10 ** 18
for i in range(T, S):
    j = i + get
    debug((S, T), (i, j), acc[j] - acc[i])

    L = S - i - 1
    R = j - S
    debug(L, R)

    if L <= (dL + 1) // 2 and R <= (dR + 1) // 2:
        X = acc[j] - acc[i]
        Y = acc[N] - X
        ans = max(ans, X - Y)

print(ans)