import sys
input=sys.stdin.readline
MI=lambda:map(int,input().split())
li=lambda:list(MI())
ii=lambda:int(input())
n=ii()
a=li()
b=li()
c=li()
i1=[b[i]-a[i] for i in range(n)]
i2=[c[i]-b[i] for i in range(n)]
p1=[0]*(n+1)
p2=[0]*(n+1)
for i in range(n):
    p1[i+1]=p1[i]+i1[i]
    p2[i+1]=p2[i]+i2[i]
m1=0
cur=0
for v in i1:
    cur+=v
    if cur<0:
        cur=0
    if cur>m1:
        m1=cur
lmx=[0]*n
cur=0
best=0
for i,v in enumerate(i1):
    cur+=v
    if cur<0:
        cur=0
    if cur>best:
        best=cur
    lmx[i]=best
rmx=[0]*n
cur=0
best=0
for i in range(n-1,-1,-1):
    cur+=i1[i]
    if cur<0:
        cur=0
    if cur>best:
        best=cur
    rmx[i]=best
m2=0
for i in range(n-1):
    s=lmx[i]+rmx[i+1]
    if s>m2:
        m2=s
suf=[0]*(n+2)
suf[n]=p1[n]
for i in range(n-1,0,-1):
    if p1[i]>suf[i+1]:
        suf[i]=p1[i]
    else:
        suf[i]=suf[i+1]
f=-p1[0]
M=[0]*(n+1)
M[1]=f-p2[0]
for i in range(2,n+1):
    v=-p1[i-1]
    if v>f:
        f=v
    g=f-p2[i-1]
    if M[i-1]>g:
        M[i]=M[i-1]
    else:
        M[i]=g
m3=0
for i in range(1,n+1):
    v=suf[i]+p2[i]+M[i]
    if v>m3:
        m3=v
extra=m1
if m2>extra:
    extra=m2
if m3>extra:
    extra=m3
sA=sum(a)
print(sA+extra)