#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using ull = unsigned long long;
template <class T>
using max_heap = priority_queue<T>;
template <class T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;
#define rep(i, l, r) for (ll i = (l); i < (r); i++)
#define rrep(i, r, l) for (ll i = (r); i-- > (l);)
#define all(x) begin(x), end(x)
template <class T>
bool chmin(T& lhs, T rhs) {
    return lhs > rhs ? (lhs = rhs, true) : false;
}
template <class T>
bool chmax(T& lhs, T rhs) {
    return lhs < rhs ? (lhs = rhs, true) : false;
}
struct IOIO {
    IOIO() { cin.tie(0)->sync_with_stdio(0); }
} ioio;
template <class S, class T>
ostream& operator<<(ostream& os, const pair<S, T>& p) {
    os << '(' << p.first << ", " << p.second << ')';
    return os;
}
template <class T>
ostream& operator<<(ostream& os, const vector<T>& vs) {
    os << '{';
    rep(i, 0, (int)vs.size()) os << vs[i] << (i + 1 == (int)vs.size() ? "" : ", ");
    os << '}';
    return os;
}
template <class T>
ostream& operator<<(ostream& os, const set<T>& vs) {
    os << '{';
    for (auto it = vs.begin(); it != vs.end(); it++) {
        if (it != vs.begin()) { os << ", "; }
        os << *it;
    }
    os << '}';
    return os;
}
template <class T, class U>
ostream& operator<<(ostream& os, const map<T, U>& vs) {
    os << '{';
    for (auto it = vs.begin(); it != vs.end(); it++) {
        if (it != vs.begin()) { os << ", "; }
        os << *it;
    }
    os << '}';
    return os;
}
#ifdef DEBUG
void dump_func() { cerr << endl; }
template <class Head, class... Tail>
void dump_func(Head&& head, Tail&&... tail) {
    cerr << head;
    if (sizeof...(Tail) > 0) { cerr << ", "; }
    dump_func(std::move(tail)...);
}
#define dump(...) cerr << "[" + string(#__VA_ARGS__) + "] ", dump_func(__VA_ARGS__)
#else
#define dump(...) static_cast<int>(0)
#endif
int main() {
    int n;
    cin >> n;
    vector a(3, vector<ll>(n));
    rep(i, 0, n) cin >> a[0][i];
    rep(i, 0, n) cin >> a[1][i];
    rep(i, 0, n) cin >> a[2][i];
    constexpr ll inf = 1e18;
    vector dp(n + 1, vector<ll>(6, -inf));
    vector to(6, vector<int>(6, -1));
    to[0][0] = 0;
    to[0][1] = 1;
    to[1][1] = 1;
    to[1][2] = 0;
    to[1][4] = 2;
    to[2][2] = 0;
    to[2][3] = 1;
    to[3][3] = 1;
    to[3][5] = 0;
    to[4][4] = 2;
    to[4][3] = 1;
    to[4][5] = 0;
    to[5][5] = 0;
    dp[0][0] = 0;
    rep(i, 0, n) {
        rep(j, 0, 6) {
            if (dp[i][j] == -inf) continue;
            rep(k, 0, 6) {
                if (to[j][k] != -1) { chmax(dp[i + 1][k], dp[i][j] + a[to[j][k]][i]); }
            }
        }
    }
    cout << *max_element(all(dp[n])) << '\n';
}