using System; using System.Collections.Generic; using System.Text; using System.Linq; class Program { public void Proc() { Reader.IsDebug = false; int num = int.Parse(Reader.ReadLine()); int ans = 0; if(num % 2 == 0) { ans = num; } else { ans--; } Console.WriteLine(ans.ToString()); } public class Reader { public static bool IsDebug = true; private static String PlainInput = @" 5 400 250 200 100 50 "; private static System.IO.StringReader Sr = null; public static string ReadLine() { if (IsDebug) { if (Sr == null) { Sr = new System.IO.StringReader(PlainInput.Trim()); } return Sr.ReadLine(); } else { return Console.ReadLine(); } } public static int[] GetInt(char delimiter = ' ', bool trim = false) { string inptStr = ReadLine(); if (trim) { inptStr = inptStr.Trim(); } string[] inpt = inptStr.Split(delimiter); int[] ret = new int[inpt.Length]; for (int i = 0; i < inpt.Length; i++) { ret[i] = int.Parse(inpt[i]); } return ret; } } static void Main() { Program prg = new Program(); prg.Proc(); } }