#include <bits/stdc++.h>

using namespace std;

using ll = long long;

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int n;
    cin >> n;
    
    vector<int> a(n + 1), b(n + 1), d(n);
    for (int i = 0; i <= n; ++i) {
        cin >> a[i];
    }
    for (int i = 0; i <= n; ++i) {
        cin >> b[i];
    }
    for (int i = 0; i < n; ++i) {
        cin >> d[i];
    }
    sort(d.begin(), d.end());

    vector< vector<int> > dp(n + 1, vector<int>(n + 1, 0));
    vector< vector<int> > memo(n + 1, vector<int>(n + 1, n));

    for (int i = 0; i <= n; ++i) {
        for (int j = 0; j <= n; ++j) {
            if (i < n) {
                int tar = a[i + 1] + b[j];
                int idx = upper_bound(d.begin(), d.begin() + memo[i][j], tar) - d.begin();
                int score = dp[i][j];
                if (idx > 0) {
                    --idx;
                    ++score;
                }
                if (dp[i + 1][j] < score || (dp[i + 1][j] == score && memo[i + 1][j] < idx)) {
                    dp[i + 1][j] = score;
                    memo[i + 1][j] = idx;
                } 
            }

            if (j < n) {
                int tar = a[i] + b[j + 1];
                int idx = upper_bound(d.begin(), d.begin() + memo[i][j], tar) - d.begin();
                int score = dp[i][j];
                if (idx > 0) {
                    --idx;
                    ++score;
                }
                if (dp[i][j + 1] < score || (dp[i][j + 1] == score && memo[i][j + 1] < idx)) {
                    dp[i][j + 1] = score;
                    memo[i][j + 1] = idx;
                } 
            }
        }
    }
    cout << dp[n][n] << "\n";
    return 0;
}