using System;

public class Program

{

    public static void Main()

    {

        int total=0;

        Console.WriteLine("紅茶10元、奶茶15元、咖啡20元，請問需要買幾杯飲料:");

        string str =Console.ReadLine();

        int num = Convert.ToInt32(str);

        for(int i=1;i<=num;i++){

            Console.WriteLine("請問第"+ i +"杯要什麼飲料，紅茶請輸入1，奶茶請輸入2，咖啡請輸入3");

            str =Console.ReadLine();

            if(str == "1"){

                total=total+10;

            }else if(str == "2"){

                total=total+15;

            }else if(str == "3"){

                total=total+20;

            }else{

                Console.WriteLine("問題都看不懂...滾!");

            }

        }

        Console.WriteLine("總共"+ total +"元");

    }

}