#include<iostream>
#include<string>
#include<queue>
#include<vector>
#include<cassert>
#include<random>
#include<set>
#include<map>
#include<cassert>
#include<unordered_map>
#include<bitset>
#include<numeric>
#include<algorithm>
using namespace std;
typedef long long ll;
const int inf=1<<30;
const ll INF=1LL<<62;
typedef pair<int,ll> P;
typedef pair<int,P> PP; 
const ll MOD=998244353;

int main(){
    int N;
    ll M,Q;
    cin>>N>>M>>Q;
    vector<ll> A(N),B(N);
    for(int i=0;i<N;i++) cin>>A[i]>>B[i];

    vector<ll> dpA(1<<N,0),dpB(1<<N,0);
    for(int S=0;S<(1<<N);S++){
        ll totalA=0,totalB=0;
        for(int i=0;i<N;i++){
            if((S>>i)&1){
                totalA+=A[i];
                totalB+=B[i];
            }
        }
        if(totalA<=M){
            dpA[S]=totalB;
        }
    }

    for(int S=0;S<(1<<N);S++){
        ll totalA=0,totalB=0;
        for(int i=0;i<N;i++){
            if((S>>i)&1){
                totalA+=A[i];
                totalB+=B[i];
            }
        }
        if(totalA<=Q){
            dpB[S]=totalB;
        }
    }

    //Aの高速ゼータ変換
    for(int S=0;S<(1<<N);S++){
        for(int i=0;i<N;i++){
            if(((1<<i)|S) != S){
                dpA[(1<<i)|S]=max(dpA[(1<<i)|S],dpA[S]);
            }
        }
    }

    for(int S=0;S<(1<<N);S++){
        for(int i=0;i<N;i++){
            if(((1<<i)|S) != S){
                dpB[(1<<i)|S]=max(dpB[(1<<i)|S],dpB[S]);
            }
        }
    }

    ll ans=0;
    for(int S=0;S<(1<<N);S++){
        int rem=((1<<N)-1)^S;
        ans=max(ans,dpA[S]+dpB[rem]);
    }
    cout<<ans<<endl;

}