#include <bits/stdc++.h>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n, l, h;
    cin >> n >> l >> h;
    vector<double> vc(n);
    for(int i = 0; i < n; ++i)
    {
        double v, s, t;
        cin >> v >> s >> t;
        int tmp = s;
        double time = 0;
        if(s < l)
            vc[i] = 100*100*50 + 1;
        else
        {
            for(int j = 1; j < 50; ++j)
            {
                tmp -= h;
                if(tmp < l)
                {
                    tmp += s;
                    time += t;
                }
                tmp -= l-h;
            }
            time += 60*50*l/v;
            vc[i] = time;
        }
    }
    double minm = 100*100*50 + 1;
    int p;
    for(int i = 0; i < n; ++i)
    {
        if(vc[i] < minm)
        {
            minm = vc[i];
            p = i+1;
        }
    }
    cout << p << endl;

    return 0;
}