using System;

using System.Collections.Generic;

​

namespace ConsoleApplication1

{

    internal class Program

    {

        public static void Calc(ref List<string> numbers, out List<string> values)

        {

            values = new List<string>();

​

            Console.WriteLine("Введите числа");

            numbers = new List<string>(Console.ReadLine()?.Split(' '));

​

            foreach (var number in numbers)

            {

                string value;

                if (Convert.ToInt32(number) % 15 == 0)

                    value = "FooBar";

                else if (Convert.ToInt32(number) % 3 == 0)

                    value = "Foo";

                else if (Convert.ToInt32(number) % 5 == 0)

                    value = "Bar";

                else

                    value = "Число не делится на 15, 3 и 5";

                values.Add(value);

            }

        }

​

        public static void Main(string[] args)

        {

            var numbers = new List<string>();

​

            Calc(ref numbers, out var values);

            for (var i = 0; i < values.Count; i++) Console.WriteLine($"{numbers[i]} : {values[i]}");

        }

    }

}