#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001


int main(){
	
	ios::sync_with_stdio(false);
	std::cin.tie(nullptr);
	
	int N,M,Q;
	cin>>N>>M>>Q;
	vector<int> a(N),b(N);
	rep(i,N)cin>>a[i]>>b[i];
	vector<pair<int,int>> dp(1<<N,make_pair(3,3));
	dp[0] = make_pair(0,0);
	rep(i,1<<N){
		if(dp[i].first == 3)continue;
		rep(j,N){
			if((i>>j)&1)continue;
			auto c = dp[i];
			if(c.first==0){
				if(c.second + a[j] <= M)c.second += a[j];
				else if(a[j] > Q)continue;
				else {
					c.first = 1;
					c.second = a[j];
				}
			}
			else{
				if(c.second + a[j] > Q)continue;
				c.second += a[j];
			}
			dp[i | (1<<j)] = min(dp[i|(1<<j)],c);
		}
	}
	long long ans = 0;
	rep(i,1<<N){
		if(dp[i].first!=3){
			long long v = 0;
			rep(j,N){
				if((i>>j)&1)v += b[j];
			}
			ans = max(ans,v);
		}
		
	}
	cout<<ans<<endl;
	
	return 0;
}