import java.util.Scanner;
 
public class ElectricityBill {
    public static double calculateBill(int units) {
        double bill = 0;
 
        if (units <= 100) {
            bill = units * 5;
        } else if (units <= 200) {
            bill = (100 * 5) + (units - 100) * 7;
        } else if (units <= 300) {
            bill = (100 * 5) + (100 * 7) + (units - 200) * 10;
        } else {
            bill = (100 * 5) + (100 * 7) + (100 * 10) + (units - 300) * 15;
        }
 
        return bill;
    }
 
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        System.out.print("Enter units consumed: ");
        int units = sc.nextInt();
 
        double amount = calculateBill(units);
 
        System.out.println("\n------- Electricity Bill -------");
        System.out.println("Units Consumed: " + units);
        System.out.printf("Total Amount: ₹%.2f\n", amount);
 
        sc.close();
    }
}