关卡数分数代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1关卡数
{
    class Program
    {
        static void Main(string[] args)
        {

            Console.Write("输入你现在的关卡数：");
            int n = int.Parse(Console.ReadLine());
            int sum = 0;
          
           
           
if(n>0&&n<=50)
{ for (int i=1;i<=n ;i++ )
{if(i<=20)
    {
    sum+=i;

    }else if(i>=20&&i<=30)
{
    sum+=10;
    }else if(i>30&&i<=40)
{
        sum+=20;
}else if(i>40&&i<=49)
{
    sum+=30;

}else{sum+=100;

}

}

}else
{
Console.WriteLine("输入无效，请重新输入！");
}

Console.WriteLine("您当前拥有的分数："+sum);
            Console.ReadLine();

            }

 

        }
    }