#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
 
int main() {
    int k, n, m;
    cin >> k >> n >> m;
    vector<pair<int, int>> data(k);
 
    for (int i = 0; i < k; ++i) {
        cin >> data[i].first >> data[i].second; // a_i, b_i
    }
 
    // Sắp xếp theo giá trị trọng số lớn nhất giữa a_i và b_i
    sort(data.begin(), data.end(), [](pair<int, int> &a, pair<int, int> &b) {
        return max(a.first, a.second) > max(b.first, b.second);
    });
 
    // Tách danh sách a và b
    vector<int> group1, group2;
    for (int i = 0; i < k; ++i) {
        if (group1.size() < n && data[i].first >= data[i].second) {
            group1.push_back(data[i].first); // Chọn nhóm loại 1
        } else if (group2.size() < m) {
            group2.push_back(data[i].second); // Chọn nhóm loại 2
        }
    }
 
    // Tính tổng trọng số
    int total_weight = 0;
    for (int w : group1) total_weight += w;
    for (int w : group2) total_weight += w;
 
    cout << total_weight << endl;
 
    return 0;
}
 

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

NiA0IDIKMTAgOQo5IDkKOCA4CjggNwo4IDEKOCAx

6 4 2
10 9
9 9
8 8
8 7
8 1
8 1