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();

}

}
}