#include <bits/stdc++.h>
using namespace std;
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using ll = long long;
const ll INF = 1e18;

//O(3^n)

int main(){
    ll n,m,q;
    cin >> n >> m >> q;
    vector<ll> a(n),b(n);
    vector<pair<ll,ll>> x(n);
    for(ll i = 0;i < n;i++){
        cin >> x[i].first >> x[i].second;
    }
    sort(x.rbegin(),x.rend());
    for(ll i = 0;i < n;i++){
        a[i] = x[i].first;
        b[i] = x[i].second;
    }
    ll msum = 0,qsum = 0,val = 0,ans = 0;
    auto rec = [&](auto &rec,ll i) -> void {
        if(i==n){
            ans = max(ans,val);
            return;
        }
        rec(rec,i+1);
        if(msum+a[i] <= m){
            msum += a[i];
            val += b[i];
            rec(rec,i+1);
            msum -= a[i];
            val -= b[i];
        }
        if(qsum+a[i] <= q){
            qsum += a[i];
            val += b[i];
            rec(rec,i+1);
            qsum -= a[i];
            val -= b[i];
        }
        return;
    };
    rec(rec,0);
    cout << ans << endl;
}