using System;

public class Program

{

    public static void Main()

    {

​

    int iceCream;

    string day;

    int temp;

    Console.WriteLine("enter weekend or weekday");

    day = Console.ReadLine();

    Console.WriteLine("please enter the temperature");

    temp = Convert.ToInt32(Console.ReadLine());

    while (20>temp || temp>45)

    {

        Console.WriteLine("please enter another temperature");

        temp = Convert.ToInt32(Console.ReadLine());

    }

    if (20<=temp && temp<=30)

    {

        iceCream = 100;

        Console.WriteLine(iceCream);

    }

    else if (31<=temp && temp<=38)

    {

        iceCream = 150;

        Console.WriteLine(iceCream);

    }

    else if (38<temp)

    {

        iceCream = 120;

        Console.WriteLine(iceCream);

    }

    }

}