using System;
public class Program
{
public static void Main(string[] arge)
int a, d;
double f;
Console.Write("輸入商品單價:");
a = int.Parse(Console.ReadLine());
d = a;
if (d >= 1000 && d < 2000)
f = d - 100;
}
else if (d >= 2000 && d < 3000)
f = d - 300;
else if (d >= 3000)
f = d - 500;
else
f = d;
Console.Write("原價(0)元,以折扣(1)元,折扣後(2)元", d, d - f, f);