using System; using System.Collections.Generic; using System.Collections; using System.Linq; using System.Text; using sc = Scanner; class Program { static void Main(string[] args) { Solve(); #if DEBUG System.Console.WriteLine("続行するには何かキーを押してください..."); System.Console.ReadKey(); #endif } /// /// ここでとく /// static void Solve() { long f0 = sc.NextLong(); long f1 = sc.NextLong(); long n = sc.NextLong(); long[] f = { f0, f1, f1 ^ f0 }; Console.WriteLine(f[n % 3]); } } /// /// Java風のスキャナー,自作(某最速の人を参考) /// public static class Scanner { public static string NextString() { string tmp = ""; while (true) { string readData = char.ConvertFromUtf32(Console.Read()); if (readData == " " || readData == "\n") break; tmp += readData; } return tmp; } public static string[] NextStrArray() { return Console.ReadLine().Split(' '); } public static long[] NextLongArray() { string[] s = NextStrArray(); long[] a = new long[s.Length]; for (int i = 0; i < a.Length; i++) { a[i] = long.Parse(s[i]); } return a; } public static int[] NextIntArray() { string[] s = NextStrArray(); int[] a = new int[s.Length]; for (int i = 0; i < a.Length; i++) { a[i] = int.Parse(s[i]); } return a; } public static int NextInt() { string tmp = ""; while (true) { string readData = char.ConvertFromUtf32(Console.Read()); if (readData == " " || readData == "\n") break; tmp += readData; } return int.Parse(tmp); } public static double NextDouble() { string tmp = ""; while (true) { string readData = char.ConvertFromUtf32(Console.Read()); if (readData == " " || readData == "\n") break; tmp += readData; } return double.Parse(tmp); } public static long NextLong() { string tmp = ""; while (true) { string readData = char.ConvertFromUtf32(Console.Read()); if (readData == " " || readData == "\n") break; tmp += readData; } return long.Parse(tmp); } public static double[] NextDoubleArray() { string[] s = NextStrArray(); double[] a = new double[s.Length]; for (int i = 0; i < a.Length; i++) { a[i] = double.Parse(s[i]); } return a; } }