using System;

public class Program

{

    public static void Main()

    {

         int p;

Console.WriteLine("enter the number of people");

p=int.Parse(Console.ReadLine());

if(p<100 && p>=0)

Console.WriteLine(50*p) ;

​

else

    if((p>=100) && (p<=200))

        Console.WriteLine(45*p) ;

​

else

    if (p>=201 && p<=300)

Console.WriteLine(40*p) ;

else

Console.WriteLine(35*p) ;

​

    }

}