using System;

public class Program

{

    public static void Main()

    {

        for (int i=1;i<=5;i++)

        {Console.WriteLine(i);}

        for(int x=10;x>=7;x--)

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

        for(int y=1;y<=15;y=y+2)

        {Console.Write(y+", ");}

        int suma=0;

        for(int c=10;c<=20;c=c+2)

        {Console.Write(c+" + ");

         suma=suma+c;

        }

        Console.Write("=?");

        Console.WriteLine();

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

    }

}