using System; using System.IO; using System.Linq; using System.Collections.Generic; public class Program { public void Proc() { long num = long.Parse(Reader.ReadLine()); long mod = 1000000007; long ans = 1; for (long i = 2; i <= num; i++) { ans = ans * ((i * (i * 2 - 1)) % mod); ans = ans % mod; } Console.WriteLine(ans); } public class Reader { private static StringReader sr; public static bool IsDebug = false; public static string ReadLine() { if (IsDebug) { if (sr == null) { sr = new StringReader(InputText.Trim()); } return sr.ReadLine(); } else { return Console.ReadLine(); } } private static string InputText = @" 114514 "; } public static void Main(string[] args) { #if DEBUG Reader.IsDebug = true; #endif Program prg = new Program(); prg.Proc(); } }