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

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

    vector<vector<bool>> v(m+1, vector<bool>(n+1));

    for (int i = 0; i < o; i++) {
        cin >> ts >> tts >> nap >> ora;
        v[tts][ts] = true;
    }

    int out;
    int max =0;

    for (int i =0; i < n+1; i++) {
        int counter = 0;
        for (int j = 0; j < m+1; j++) {
            //cout<<v[i][j]<<" ";
            if (v[i][j]) counter++;

        }
        if (counter > max) {
            max = counter;
            out = i;
        }
        //cout<<endl;
    }
    cout<<out;
}