#include <bits/stdc++.h>
#include <iostream>
using namespace std;

int returnVecMax(vector<int> a) {
    int out = a[0];
    int index = 0;
    for (int i =1; i < a.size(); i++) {
        if (a[i] > out) {
            out = a[i];
            index = i;
        }
    }
    return index;
}

int main() { 
    int o, n, m, t, h;
    cin >> o >> n >> m >> t >> h;
    n +=1;
    m +=1;
    int ts, tts, nap, ora;

    vector <vector <bool>> tan (m, vector<bool>(n));
    vector <int> legtobb(m);


    for (int i = 1; i <= o; i++) {
        cin >> ts >> tts >> nap >> ora;

        tan[tts][ts] = 1;

    }

    for (int i = 0; i < n; i++) {
        for (int j = 0 ; j < m; j++) {
            if (tan[i][j]) {
                legtobb[i] += 1;

            }
        }
    }


    //debug
    // for (int i = 0 ; i < m; i++) {
    //     for (int j = 0; j < n; j++) {
    //         cout<<tan[i][j]<<' ';
    //     }
    //     cout<<endl;
    // }

    // cout<<endl;

    // for (int i = 0 ; i < m; i++) {
    //     cout<<legtobb[i]<< ' ';
    // }
    // cout<<endl;

    cout<<returnVecMax(legtobb);
}