using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Linq; using System.Numerics; using System.Text; using System.Text.RegularExpressions; using System.Threading.Tasks; using static System.Math; public static class P { public static void Main() { var pqr = Console.ReadLine().Split().Select(double.Parse).ToArray(); Console.WriteLine(1 - pqr.Min() / pqr.Sum()); } }