#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n, m, q;
    cin >> n >> m >> q;
    vector<ll> a(n), b(n);
    rep(i,n) cin >> a[i] >> b[i];
    vector<ll> c(1<<n), v(1<<n);
    vector<ll> dp(1<<n, -1e18), ep(1<<n, -1e18);
    rep(i,1<<n){
        rep(j,n) if(i>>j&1){
            c[i] += a[j];
            v[i] += b[j];
        }
    }
    rep(i,1<<n){
        if(c[i]>m) continue;
        dp[i] = max(dp[i], v[i]);
        rep(j,n){
            if(i>>j&1) continue;
            dp[i|(1<<j)] = max(dp[i|1<<j], dp[i]);
        }
    }
      rep(i,1<<n){
        if(c[i]>q) continue;
        ep[i] = max(ep[i], v[i]);
        rep(j,n){
            if(i>>j&1) continue;
            ep[i|(1<<j)] = max(ep[i|1<<j], ep[i]);
        }
    }
    int mask = (1<<n)-1;
    ll ans = 0;
    dbg(dp);
    rep(i,1<<n){
        ans = max(ans, dp[i]+ep[i^mask]);
    }
    cout<<ans<<endl;
    return 0;
}