public void Solve()
{
Scan();
PriortyQueue <int> pq = new PriortyQueue <int>((a, b) => - a.CompareTo(b));
long[] memoR = new long[N + 1];
long sum = 0;
for (int i = 0; i < N; i++)
{
pq.Add(A[i]);
sum += A[i];
}
memoR[0] = sum;
for (int i = 0; i < N; i++)
{
sum += A[N + i];
pq.Add(A[N + i]);
sum -= pq.Poll();
memoR[i + 1] = sum;
}
sum = 0;
pq = new PriortyQueue <int>((a, b) => a.CompareTo(b));
long[] memoL = new long[N + 1];
for (int i = 0; i < N; i++)
{
pq.Add(A[3 * N - 1 - i]);
sum += A[3 * N - 1 - i];
}
memoL[N] = sum;
for (int i = 0; i < N; i++)
{
sum += A[2 * N - 1 - i];
pq.Add(A[2 * N - 1 - i]);
sum -= pq.Poll();
memoL[N - 1 - i] = sum;
}
long ans = long.MinValue;
for (int i = 0; i <= N; i++)
{
ans = Math.Max(ans, memoR[i] - memoL[i]);
}
Console.WriteLine(ans);
}