Java 代码

import java.util.Scanner;

public class Main
{
    public static void main (String[] args)
    {
        Scanner cin = new Scanner(System.in);

        int i = cin.nextInt();
        int c = cin.nextInt();

        double[] p = {4.00, 4.50, 5.00, 2.00, 1.50};

        System.out.println("Total: R$ " + String.format("%.2f", p[i-1] * c));
    }
}