using System;

public class Program

{

    public static void Main()

    {

        for (int i=1; i<=10; i++)

        {Console.WriteLine(i);}

        for (int x=10; x>=1; x--)

        {Console.Write(x+" ");}

        int suma=0;

            for(int z=1; z<=19; z=z+2)

            {suma=suma+z;}

        Console.WriteLine("Сумата ={0}",suma);

        int p=1;

        for (int j=3; j<=15; j=j+3)

        {p=p*j;}

        Console.WriteLine("Произведението= {0}",p);

        double c;f;

        Console.WriteLine("C    F");

        for (c=0.0; c<10.0

​

    }

}