#pragma GCC optimize ("O3")
#pragma GCC target ("avx")
#include "bits/stdc++.h" // define macro "/D__MAI"

using namespace std;
typedef long long int ll;

#define debugv(v) printf("L%d %s => ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;
#define debugm(m) printf("L%d %s is..\n",__LINE__,#m);for(auto v:m){for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debuga(m,w) printf("L%d %s is => ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;
#define debugaa(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[x][y]<<" ";}cout<<endl;}
#define debugaar(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[y][x]<<" ";}cout<<endl;}
#define ALL(v) (v).begin(),(v).end()
#define repeat(l) for(auto cnt=0;cnt<(l);++cnt)
#define iterate(b,e) for(auto cnt=(b);cnt!=(e);++cnt)
#define MD 1000000007ll
#define PI 3.1415926535897932384626433832795
template<typename T1, typename T2>
ostream& operator <<(ostream &o, const pair<T1, T2> p) { o << "(" << p.first << ":" << p.second << ")"; return o; }

#define TIME chrono::system_clock::now()
#define MILLISEC(t) (chrono::duration_cast<chrono::milliseconds>(t).count())
namespace {
    std::chrono::system_clock::time_point ttt;
    void tic() { ttt = TIME; }
    void toc() { fprintf(stderr, "TIME : %lldms\n", MILLISEC(TIME - ttt)); }
    std::chrono::system_clock::time_point tle = TIME;
#ifdef __MAI
    void safe_tle(int msec) { assert(MILLISEC(TIME - tle) < msec); }
#else
#define safe_tle(k) ;
#endif
}

#ifdef __MAI //_getchar_nolock
#define getchar_unlocked getchar
#endif
namespace {
#define isvisiablechar(c) (0x33<=(c)&&(c)<=0x7E)
    class MaiScanner {
    public:
        template<typename T>
        void input_integer(T& var) {
            var = 0;
            T sign = 1;
            int cc = getchar_unlocked();
            for (; cc<'0' || '9'<cc; cc = getchar_unlocked())
                if (cc == '-') sign = -1;
            for (; '0' <= cc&&cc <= '9'; cc = getchar_unlocked())
                var = (var << 3) + (var << 1) + cc - '0';
            var = var*sign;
        }
        inline int c() { return getchar_unlocked(); }
        inline MaiScanner& operator>>(int& var) {
            input_integer<int>(var);
            return *this;
        }
        inline MaiScanner& operator>>(long long& var) {
            input_integer<long long>(var);
            return *this;
        }
        inline MaiScanner& operator>>(string& var) {
            int cc = getchar_unlocked();
            for (; !isvisiablechar(cc); cc = getchar_unlocked());
            for (; isvisiablechar(cc); cc = getchar_unlocked())
                var.push_back(cc);
        }
    };
}
MaiScanner scanner;



int width, height;
int m, n, kei;

ll aa[300010];

const ll TINY = -1e20;



int main() {
    int i, j, k;
    ll a, b;

    const ll ofs = 2000000000;

    scanner >> n;

    repeat(3 * n) {
        scanner >> a;
        aa[cnt] = a;
    }


    vector<ll> cpp;
    vector<ll> cpm;

    {
        priority_queue<ll> pq;
        ll sum = 0;
        repeat(n) {
            pq.push(-aa[cnt]);
            sum += aa[cnt];
        }

        cpp.push_back(sum);
        iterate(n, 2 * n) {
            sum += aa[cnt];
            pq.push(-aa[cnt]);
            sum += pq.top(); pq.pop();
            cpp.push_back(sum);
        }
    }

    {
        priority_queue<ll> pq;
        ll sum = 0;
        iterate(2 * n, 3 * n) {
            pq.push(aa[cnt]);
            sum += aa[cnt];
        }

        cpm.push_back(sum);
        for (int cnt = 2 * n - 1; n <= cnt; --cnt) {
            sum += aa[cnt];
            pq.push(aa[cnt]);
            sum -= pq.top(); pq.pop();
            cpm.push_back(sum);
        }
    }
    
    reverse(ALL(cpm));

    ll result = TINY;
    repeat(n+1) {
        result = max(result, cpp[cnt] - cpm[cnt]);
    }
    

    cout << result << endl;


    
    return 0;
}

Measured memory_bytes: 5992