OOP 5 numbers

using System;

namespace numbersNs {
    public class numbers{
        private double _num1;
        public double num1{
            get {
                return _num1;
            }
            set {
                _num1 = value;
            }
        }

        private double _num2;
        public double num2{
            get {
                return _num2;
            }
            set {
                _num2 = value;
            }
        }

        private double _num3;
        public double num3{
            get {
                return _num3;
            }
            set {
                _num3 = value;
            }
        }

        private double _num4;
        public double num4{
            get {
                return _num4;
            }
            set {
                _num4 = value;
            }
        }

        private double _num5;
        public double num5{
            get {
                return _num5;
            }
            set {
                _num5 = value;
            }
        }

        public double numPositive{
            get {
                double _numPositive = 0;

                if( _num1 >= 0) _numPositive++;
                if( _num2 >= 0) _numPositive++;
                if( _num3 >= 0) _numPositive++;
                if( _num4 >= 0) _numPositive++;
                if( _num5 >= 0) _numPositive++;

                return _numPositive;
            }
        }

        public double numNegative{
            get {
                double _numNegative = 0;

                if( _num1 < 0) _numNegative++;
                if( _num2 < 0) _numNegative++;
                if( _num3 < 0) _numNegative++;
                if( _num4 < 0) _numNegative++;
                if( _num5 < 0) _numNegative++;

                return _numNegative;
            }
        }

        public double numSum{
            get {
                return _num1 + _num2 + _num3 + _num4 + _num5;
            }
        }

        public double numProduct{
            get {
                return _num1 * _num2 * _num3 * _num4 * _num5;
            }
        }


    }

    public class Program: numbers{

        public static void Main(){
            numbers nums = new numbers();
            double OutVal;
            bool looping = false;

            cls();

            print("Insert 5 numbers: \n");

            double.TryParse(input("First number: "), out OutVal);
            nums.num1 = OutVal;
            double.TryParse(input("Second number: "), out OutVal);
            nums.num2 = OutVal;
            double.TryParse(input("Third number: "), out OutVal);
            nums.num3 = OutVal;
            double.TryParse(input("Fourth number: "), out OutVal);
            nums.num4 = OutVal;
            double.TryParse(input("Fifth number: "), out OutVal);
            nums.num5 = OutVal;

            looping = true;

            cls();

            while (looping){
                print(String.Format("Numbers you have: \n{0} {1} {2} {3} {4}\n",nums.num1, nums.num2, nums.num3, nums.num4, nums.num5));

                print("\nWhat should I do now?");
                print("1 - Get the number of positive numbers");
                print("2 - Get the number of negative numbers");
                print("3 - Get sum of all the numbers");
                print("4 - Get product of all the numbers");
                print("5 - Exit\n");


                while (true){
                    ConsoleKeyInfo Out = inputKey("Choose: ");
                    if (Out.KeyChar.ToString() =="1")
                        print(String.Format("\nAnswer: {0}",nums.numPositive));
                    else if (Out.KeyChar.ToString() =="2")
                        print(String.Format("\nAnswer: {0}",nums.numNegative));
                    else if (Out.KeyChar.ToString() =="3")
                        print(String.Format("\nAnswer: {0}",nums.numSum));
                    else if (Out.KeyChar.ToString() =="4")
                        print(String.Format("\nAnswer: {0}",nums.numProduct));
                    else if (Out.KeyChar.ToString() =="5")
                        looping = false;
                    else {
                        print("Error!");
                        continue;
                    }
                    if (Out.KeyChar.ToString() !="5")
                        inputKey("\nPress any key to continue...");

                    cls();
                    break;


                }

            }



        }

        static void setNumVal(object obj){
            double Out;
            while (true){
                double.TryParse(input(), out Out);

                if (double.IsNaN(Out)){
                    print("Error!");
                    continue;
                } else {
                    obj = Out;
                    break;
                }
            }
        }

        //simplified function for printing
        static void print(String str, bool newline = true)
        {
            if (newline)
                Console.WriteLine(str);
            else
                Console.Write(str);
        }

        //simplified function for getting the user input
        static String input(String str = "")
        {
            if (str != "") print(str,false);

            return Console.ReadLine();
        }

        //simplified function for getting the user input key
        static ConsoleKeyInfo inputKey(String str = "")
        {
            if (str != "") print(str,false);

            return Console.ReadKey();
        }

        //simplified function for clering the screen
        static void cls()
        {
            Console.Clear();
        }

    }



}