import java.io.*;
import java.util.*;
import java.util.function.*;
import java.util.stream.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int a = sc.nextInt();
        int b = sc.nextInt();
        int[] prices = new int[n];
        int[] values = new int[n];
        for (int i = 0; i < n; i++) {
            prices[i] = sc.nextInt();
            values[i] = sc.nextInt();
        }
        long[] weights = new long[1 << n];
        long[][] dp = new long[1 << n][2];
        for (int i = 0; i < (1 << n); i++) {
            for (int j = 0; j < n; j++) {
                if ((i & (1 << j)) == 0) {
                    continue;
                }
                weights[i] = weights[i ^ (1 << j)] + prices[j];
                if (weights[i] <= a) {
                    dp[i][0] = dp[i ^ (1 << j)][0] + values[j];
                }
                if (weights[j] <= b) {
                    dp[i][1] = dp[i ^ (1 << j)][1] + values[j];
                }
                break;
            }
            for (int j = 0; j < n; j++) {
                if ((i & (1 << j)) == 0) {
                    continue;
                }
                dp[i][0] = Math.max(dp[i][0], dp[i ^ (1 << j)][0] + values[j]);
                dp[i][1] = Math.max(dp[i][1], dp[i ^ (1 << j)][1] + values[j]);
            }
        }
        long ans = 0;
        for (int i = 0; i < (1 << n); i++) {
            ans = Math.max(ans, dp[i][0] + dp[((1 << n) - 1) ^ i][1]);
        }
        System.out.println(ans);
    }
}
class Scanner {
    BufferedReader br;
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() {
        try {
            br = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            
        }
    }
    
    public int nextInt() {
        return Integer.parseInt(next());
    }
    
    public long nextLong() {
        return Long.parseLong(next());
    }
    
    public double nextDouble() {
        return Double.parseDouble(next());
    }
    
    public String next() {
        try {
            while (!st.hasMoreTokens()) {
                st = new StringTokenizer(br.readLine());
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            return st.nextToken();
        }
    }
    
}