n=int(input())
taste=[[1**18]*n for _ in range(3)]
for i in range(3):
    taste[i]=list(map(int,input().split()))
dp=[[-1**18]*3 for _ in range(3)]
dp[0][0]=0
for i in range(n):
    ndp=[[1**18]*3 for _ in range(3)]
    for x in range(3):
        for y in range(3):
            for a in range(2):
                for b in range(2):
                    if x+a>2 or y+b>2:
                        continue
                    ndp[x+a][y+b]=max(ndp[x+a][y+b],dp[x][y]+taste[(x+a)%2+(y+b)%2][i])
    dp=ndp
ans=-1**18
for x in range(3):
    for y in range(3):
        ans=max(ans,dp[x][y])
print(ans)