N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
X = list(map(int,input().split()))
Y = list(map(int,input().split()))
ans = 0

for i in range(N):
    s = max(A[i * 2] + A[i * 2 + 1],B[i * 2] + B[i * 2 + 1]) + X[i]
    t = max(A[i * 2] + B[i * 2 + 1],B[i * 2] + A[i * 2 + 1]) + Y[i]
    ans += max(s,t)
print(ans)