N=int(input())
s,t=map(int,input().split())
A=[int(x) for x in input().split()]
B=[A[(i+s-1)%N] for i in range(N)]
s,t=0,t-s
a,b=t-s-1,N-t-1
ans=2*B[0]-sum(B)
u,v=0,0
while 2*(u+v)<N-2:
    if 2*(u+1)<=a:
        ans+=2*B[u]
        u+=1
    elif 2*(v+1)<=b:
        ans+=2*B[N-1-v]
        v+=1
    else:
        ans+=2*max(B[u],B[N-1-v])
        break
print(ans)