int boy, girl,i,c,p,a,b,d;
            c=1;
            Console.WriteLine("ata/at lo yeholim la'avod alay! mispar habanim hayav lihyot gadol mi'mispar habanot");
            Console.WriteLine();
            Console.WriteLine("please insert the number of boys: ");
            boy = int.Parse(Console.ReadLine());
            Console.WriteLine("please insert the number of girls: ");
            girl = int.Parse(Console.ReadLine());
            for (i = 1; i <= c; i++)
            {
                if (girl > boy)
                {
                    c++;
                    Console.WriteLine("tin tin tin !!wrong!! the number of boy must be bigger then girls!! try again");
                    Console.WriteLine("boys: ");
                    boy = int.Parse(Console.ReadLine());
                    Console.WriteLine("girls: ");
                    girl = int.Parse(Console.ReadLine());
                }
                else
                {
                    p = boy - girl;
                    Console.WriteLine("the hefresh between boy to girls is: " + p);
                    a = boy + girl;
                    Console.WriteLine("the number of students in the class is: " + a);
                    b = a - p;
                    d = b / 2;
                    Console.WriteLine("the number of zugot is: " +d);
                }

            }