#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);
    rep(i,1<<n){
        rep(j,n) if(i>>j&1){
            c[i] += a[j];
            v[i] += b[j];
        }
    }
    int mask = (1<<n)-1;
    ll ans = 0;
    rep(i,1<<n){
        if(c[i]>m) continue;
        int ret = m - c[i];
        int r = i^mask;
        for (int t=r; ; t=(t-1)&r) {
            if(c[t]>q) continue;
            ans = max(ans, v[i]+v[t]);
            if (t==0) break;
        }
    }
    cout<<ans<<endl;
    return 0;
}