#include<bits/stdc++.h>
#include<queue>
#include<string.h>
#include<iostream>
#include<map>
#include<vector>
#include<algorithm>
#define int long long
#define ll long long
#define ull unsigned long long
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define nl t[n].l
#define nr t[n].r
#define gcd __gcd
#define itn int
using namespace std;
const int maxn=1e6+50;
const int N=1e5+50;
const int inf=31525197391593473;
const int INF=2e18;
const int mod=998244353;
const double eps=1e-12;
#define pop_count __builtin_popcountll
//const ull mask = std::chrono::steady_clock::now().time_since_epoch().count();
int a[maxn],b[maxn],c[maxn],d[maxn];
set<int> s1[5005],s2[5005];
void solve()
{
   int n,k1,k2;
   cin>>n>>k1>>k2;
   rep(i,1,n)
   {
       cin>>a[i]>>b[i]>>c[i]>>d[i];
   }
   f[0][0]=1;
   int ans=0;
   map<array<int,2>,int> mp;
   s1[0].insert(0);
   mp[{0,0}]=1;
   rep(i,1,n)
   {
       rep(o,0,n)
       {for(auto x:s1[o])
       {
           int j=o,k=x;
          // cout<<j<<' '<<k<<'\n';
           if(k1+j>=a[i]&&k1+j<=b[i]&&k2+k>=c[i]&&k2+k<=d[i])
            {
                  ans=max(ans,j+k+1);
                  if(!mp[{j,k+1}])
                    {
                        mp[{j,k+1}]++;
                        s2[o].insert(k+1);
                    }
                    if(!mp[{j+1,k}])
                    {
                        mp[{j+1,k}]++;
                        s2[o+1].insert({j+1,k});
                    }
            }
            else s2[o].insert({j,k});
       }
       swap(s1[o],s2[o]);
       s2[o].clear();
       }
   }
   cout<<ans;


}


signed main()
{
   ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
   int __=1;
   srand((time(0)));

  //cin>>__;

  while(__--)
  {
       solve();
  }
    return 0;
}

answer.code: In function ‘void solve()’:
answer.code:35:4: error: ‘f’ was not declared in this scope
   35 |    f[0][0]=1;
      |    ^