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

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

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

    int n2 = 1<<N,inf = max(M,Q)+1;
    vector<int> S(n2);
    vector<long long> 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) >= inf) break;
        }
    }

    long long answer = 0;
    for(int i=0; i<n2; i++){
        for(int k=i; k>0; k=(k-1)&i){
            if(S.at(k) > Q) continue;
            int left = i-k;
            if(S.at(left) > M) continue;
            answer = max(answer,S2.at(i)); break;
        }
    }
    cout << answer << endl;
}