#include <bits/stdc++.h>
#define fir first
#define sec second
#define FINISH cout << "FINISH" << endl;
#define debug(x) cerr << #x << " : = " << endl;
using namespace std;
typedef long long ll;
typedef pair<int, int> PII;
const int N = 200020;
const int M = 200010;
const int inf = 0x3f3f3f3f;
int a[N], b[N], sum[N];
int dp[2][5000010];
void solve()
{
    int n, stx, sty;
    cin >> n >> stx >> sty;
    vector<PII> a(n + 1);
    vector<PII> b(n + 1);
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i].fir >> a[i].sec >> b[i].fir >> b[i].sec;
        a[i].fir -= stx;
        a[i].sec -= sty;
        b[i].fir -= stx;
        b[i].sec -= sty;
    }
    auto isin = [&](int x, int y, int inp)
    {
        if (a[inp].fir <= x && x <= a[inp].sec && b[inp].fir <= x && x <= b[inp].sec)
        {
            return true;
        }
        return false;
    };
    vector<vector<int>> dp(n + 1, vector<int>(n + 1, inf));
    int ans = 0;
    int now = 1;
    for (int i = 1; i <= n; i++)
    {
        while (!isin(i, 0, now) && now <= n)
        {
            now++;
        }
        if (now == n + 1)
            break;
        dp[i][0] = now;
        ans = max(ans, i);
    }
    for (int i = 1; i <= n; i++)
    {
        while (!isin(0, i, now) && now <= n)
        {
            now++;
        }
        if (now == n + 1)
            break;
        dp[0][i] = now;
        ans = max(ans, i);
    }
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; i + j <= n; j++)
        {
            if (dp[i - 1][j] != inf) {
                now = dp[i - 1][j] + 1;
                while (!isin(i, j, now) && now <= n)
                {
                    now++;
                }
                if (now != n + 1) {
                    dp[i][j] = min(dp[i][j], now);
                    ans = max(ans, i + j);
                }
            }
            
            if (dp[i][j - 1] != inf) {
                now = dp[i][j - 1];
                while (!isin(i, j, now) && now <= n)
                {
                    now++;
                }
                if (now != n + 1) {
                    dp[i][j] = min(dp[i][j], now);;
                    ans = max(ans, i + j);
                }
            }
            

        }
    }

    cout << ans << endl;
}
signed main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    int T = 1;
    // cin >> T;
    while (T--)
    {
        solve();
    }
}