#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int ar[1000100], sum[1000100];
int main()
{
    int n, a, b, c, i, ans = 0, vl = 0, l, r, s = 0;
    cin >> n >> a >> b >> c;
    for (i = 0; i < n; i++)
    {
        scanf("%d%d", &l, &r);
        ar[l]++;
        ar[r + 1]--;
    }

    for (i = 1; i <= a; i++)
    {
        s += ar[i];
        if (s > 0)
            ar[i] = 1;
        else
            ar[i] = 0;

        sum[i] = sum[i - 1] + ar[i];
        if ((i >= b) && (sum[i] - sum[i - b] > c))
        {
            cout << "No\n";
            return 0;
        }
    }

    cout << "Yes\n";
    return 0;
}