using System;

namespace ExtremelyDangerousVirus
{
    class Program
    {
        private static ulong Power(ulong x, ulong y, ulong p)
        {
            ulong res = 1;

            x = x % p;

            while (y > 0)
            {
                if (y % 2 != 0)
                    res = (res * x) % p;

                y = y >> 1;
                x = (x * x) % p;
            }
            return res;
        }

        static void Main(string[] args)
        {
            var tokens = Console.ReadLine().Split(' ');
            var a = Convert.ToUInt64(tokens[0]);
            var b = Convert.ToUInt64(tokens[1]);
            var t = Convert.ToUInt64(tokens[2]);
            ulong c = (a + b) / 2;

            Console.WriteLine(Power(c, t, 1000000007));
        }
    }
}