#include <bits/stdc++.h>
using namespace std;

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

    long long N,M,Q; cin >> N >> M >> Q;
    vector<long long> A(N),B(N);
    for(int i=0; i<N; i++) cin >> A.at(i) >> B.at(i);

    int n2 = 1<<N;
    vector<bool> buy(n2);
    vector<long long> S(n2),S2(n2);
    for(int i=0; i<n2; i++){
        for(int k=0; k<N; k++){
            if(!(i&(1<<k))) continue;
            S.at(i) += A.at(k);
            S2.at(i) += B.at(k);
        }
        if(S.at(i) <= M) buy.at(i) = true;
    }

    long long answer = 0;
    for(int i=0; i<n2; i++){
        if(buy.at(i)){answer = max(answer,S2.at(i)); continue;}

        int pos = i^(n2-1);
        if(buy.at(pos) == false) continue;
        if(S2.at(pos) > Q) continue;
        answer = max(answer,S2.at(i));  
    }
    cout << answer << endl;
}