#include <iostream>
#include <vector>
#include <algorithm>
#include <queue>

using namespace std;

const int N = 500010;
int X[N], L[N];

class FastScanner {
public:
    FastScanner() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }

    int nextInt() {
        int x;
        cin >> x;
        return x;
    }
};

int main() {
    FastScanner f;
    int n = f.nextInt();
    priority_queue<int> q;
    vector<array<int, 3>> tr;
    for (int i = 1; i <= n; ++i) X[i] = f.nextInt();
    for (int i = 1; i <= n; ++i) L[i] = f.nextInt();
    for (int i = 1; i <= n; ++i) tr.push_back({X[i] + L[i], X[i], L[i]});
    sort(tr.begin(), tr.end());
    
    long long sum = 0, ans = 0;
    for (int i = 1; i <= n; ++i) {
        auto &c = tr[i - 1];
        int X1 = c[1], L1 = c[2];
        if (sum <= L1) {
            sum += X1;
            q.push(X1);
            ++ans;
        } else {
            if (!q.empty() && q.top() > X1) {
                sum -= q.top();
                q.pop();
                sum += X1;
                q.push(X1);
            }
        }
    }
    cout << ans << "\n";
    return 0;
}

answer.code: In constructor ‘FastScanner::FastScanner()’:
answer.code:15:17: error: ‘nullptr’ was not declared in this scope
   15 |         cin.tie(nullptr);
      |                 ^~~~~~~
answer.code: In function ‘int main()’:
answer.code:29:12: error: ‘array’ was not declared in this scope
   29 |     vector<array<int, 3>> tr;
      |            ^~~~~
answer.code:29:12: note: ‘std::array’ is only available from C++11 onwards
answer.code:29:27: error: template argument 1 is invalid
   29 |     vector<array<int, 3>> tr;
      |                           ^~
answer.code:29:27: error: template argument 2 is invalid
answer.code:32:34: error: ‘tr’ was not declared in this scope; did you mean ‘tm’?
   32 |     for (int i = 1; i <= n; ++i) tr.push_back({X[i] + L[i], X[i], L[i]});
      |                                  ^~
      |                                  tm
answer.code:32:47: warning: extended initializer lists only available with ‘-std=c++11’ or ‘-std=gnu++11’ [-Wc++11-extensions]
   32 |     for (int i = 1; i <= n; ++i) tr.push_back({X[i] + L[i], X[i], L[i]});
      |                                               ^
answer.code:33:10: error: ‘tr’ was not declared in this scope; did you mean ‘tm’?
   33 |     sort(tr.begin(), tr.end());
      |          ^~
      |          tm
answer.code:37:15: error: ISO C++ forbids declaration of ‘c’ with no type [-fpermissive]
   37 |         auto &c = tr[i - 1];
      |               ^
answer.code:38:19: error: invalid types ‘int[int]’ for array subscript
   38 |         int X1 = c[1], L1 = c[2];
      |                   ^
answer.code:39:20: error: ‘L1’ was not declared in this scope; did you mean ‘X1’?
   39 |         if (sum <= L1) {
      |                    ^~
      |                    X1