using System;
using System.Linq;
using System.Collections.Generic;

static class NagataKanaIsAGenius {
    public static void Main() {
        int[]a=Console.ReadLine().Split().Select(int.Parse).ToArray();
        Console.WriteLine(Math.Min(a[0],Math.Min(a[1]/a[2],(a[1]+a[3])/(1+a[2]))));
    }
}