using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class Magatro
{
    static void Main()
    {
        double[] q = Console.ReadLine().Split(' ').Select(s => double.Parse(s)).ToArray();
       double X, Y;
        double A, B,P;
        P = q[0] + q[1];
        A = (q[0])/P;
        B = (q[1])/P;
        X = q[2];
        Y = q[3];
       Console.WriteLine(Math.Min( X / A ,Y / B));
    }
}