using System; using System.IO; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Text; using System.Numerics; using System.Threading.Tasks; using System.Text.RegularExpressions; using static System.Math; using Debug = System.Diagnostics.Debug; using MethodImplOptions = System.Runtime.CompilerServices.MethodImplOptions; using MethodImplAttribute = System.Runtime.CompilerServices.MethodImplAttribute; static class P { static void Main() { var abxy = Console.ReadLine().Split().Select(double.Parse).ToArray(); Console.WriteLine(Min(abxy[2] / abxy[0], abxy[3] / abxy[1]) * (abxy[0] + abxy[1])); } }