import std;

void main() {
    long N;
    readf("%d\n", N);

    auto A = readln.chomp.split.to!(long[]);
    auto B = readln.chomp.split.to!(long[]);
    auto X = readln.chomp.split.to!(long[]);
    auto Y = readln.chomp.split.to!(long[]);

    long res;
    foreach (i; 0 .. N) {
        long p = i * 2, q = i * 2 + 1;
        res += max(A[p]+A[q]+X[i], A[p]+B[q]+Y[i], B[p]+A[q]+Y[i], B[p]+B[q]+X[i]);
    }

    res.writeln;
}