AccountBalance

import java.util.Scanner;

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

        int n = Integer.parseInt(scanner.nextLine());
        int i = 0;

        double total = 0.0;
        while (i < n) {
            double number = Double.parseDouble(scanner.nextLine());
            if (number < 0) {
                System.out.println("Invalid operation!");
                break;
            }

            System.out.printf("Increase: %.2f%n", number);
            total += number;
            i++;
        }

        System.out.printf("Total: %.2f", total);
    }
}