Vending machine example

import java.util.Scanner;

public class SoftUni {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String coins = sc.nextLine();
        double sum = 0;
        while (!coins.equals("Start")) {
            if (coins.equals("0.1") || coins.equals("0.2") ||
                coins.equals("0.5") || coins.equals("1") || coins.equals("2")){
                sum += Double.parseDouble(coins);
            }
            else{
                System.out.printf("Cannot accept %.2f",Double.parseDouble(coins));
                System.out.println();
            }
            coins = sc.nextLine();
        }
        String products = sc.nextLine();
        double productsSum = 0;
        while(!products.equals("End")){
            double price = 0;
            boolean productVeri = true;
            switch(products){
                case "Nuts":
                    price = 2;
                    break;
                case "Water":
                    price = 0.7;
                    break;
                case "Crisps"  :
                    price = 1.5;
                    break;
                case "Soda":
                    price = 0.8;
                    break;
                case "Coke":
                    price = 1;
                    break;
                default:
                    System.out.println("Invalid product!");
                    productVeri = false;
                    break;
            }

            if(price > sum && productVeri){
                System.out.println("Sorry not enough money.");
            }
            else{
                System.out.println("Purchased " + products);
                sum -= price;
            }
            products = sc.nextLine();
        }

        System.out.printf("Change: %.2f", sum);
    }

}