import sys
readline = sys.stdin.readline

N = int(readline())

if N == 1:
    print(0)
else:
    s, t = map(int, readline().split())
    s -= 1
    t -= 1
    
    A = list(map(int, readline().split()))
    A = A[s:] + A[:s]
    t = (t-s)%N
    
    total = sum(A)
    X = A[0]
    C1 = A[1:t]
    C2 = A[N-1:t:-1]
    l1 = len(C1)
    l2 = len(C2)
    
    if l1 & 1 and l2 & 1:
        X += max(sum(C1[:l1//2])+sum(C2[:1+l2//2]), sum(C1[:1+l1//2])+sum(C2[:l2//2])) 
    else:
        X += sum(C1[:(l1+1)//2]) + sum(C2[:(l2+1)//2])
    ans = 2*X - total
    print(ans)