2-4-8

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Numerics;

namespace _2_4_8
{
    class _2_4_8
    {
        static void Main()
        {
            Console.Write("a = ");
            BigInteger a = BigInteger.Parse(Console.ReadLine());
            Console.Write("b = ");
            BigInteger b = BigInteger.Parse(Console.ReadLine());
            Console.Write("c = ");
            BigInteger c = BigInteger.Parse(Console.ReadLine());
            BigInteger R = 0;

            if (b == 2)
            {
                R = a % c;

            }
            if (b == 4)
            {
                R = a + c;
            }
            if (b == 8)
            {
                R = a * c;
            }
            if (R % 4 == 0)
            {
                Console.WriteLine(R / 4);
            }
            else
            {
                Console.WriteLine(R % 4);
            }
            Console.WriteLine(R);

        }
    }
}