#include <bits/stdc++.h>
using namespace std;
#define FOR(i,m,n) for(int i=(m);i<(n);++i)
#define REP(i,n) FOR(i,0,n)
using ll = long long;
constexpr int INF = 0x3f3f3f3f;
constexpr long long LINF = 0x3f3f3f3f3f3f3f3fLL;
constexpr double EPS = 1e-8;
constexpr int MOD = 998244353;
// constexpr int MOD = 1000000007;
constexpr int DY4[]{1, 0, -1, 0}, DX4[]{0, -1, 0, 1};
constexpr int DY8[]{1, 1, 0, -1, -1, -1, 0, 1};
constexpr int DX8[]{0, -1, -1, -1, 0, 1, 1, 1};
template <typename T, typename U>
inline bool chmax(T& a, U b) { return a < b ? (a = b, true) : false; }
template <typename T, typename U>
inline bool chmin(T& a, U b) { return a > b ? (a = b, true) : false; }
struct IOSetup {
  IOSetup() {
    std::cin.tie(nullptr);
    std::ios_base::sync_with_stdio(false);
    std::cout << fixed << setprecision(20);
  }
} iosetup;

int main() {
  int n, m, q; cin >> n >> m >> q;
  vector<int> a(n), b(n); REP(i, n) cin >> a[i] >> b[i];
  ll ans = 0;
  const auto dfs = [&](auto dfs, const int i, const int today, const int tomorrow, const ll value) -> void {
    if (i == n) {
      chmax(ans, value);
      return;
    }
    dfs(dfs, i + 1, today, tomorrow, value);
    if (today >= a[i]) dfs(dfs, i + 1, today - a[i], tomorrow, value + b[i]);
    if (tomorrow >= a[i]) dfs(dfs, i + 1, today, tomorrow - a[i], value + b[i]);
  };
  dfs(dfs, 0, m, q, 0);
  cout << ans << '\n';
  return 0;
}