Currency Converter

import java.util.Scanner;

public class p12_CurrencyConverter {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        double num = Double.parseDouble(scan.nextLine());
        String first = scan.nextLine();
        String second = scan.nextLine();

        if (first.equals("USD")) {
            if (second.equals("BGN")) {
                double Sum = num * 1.79549;
                System.out.printf("%.2f BGN", Sum);
            } else if (second.equals("EUR")) {
                double Sum = num * 0.91801;
                System.out.printf("%.2f EUR", Sum);
            }
            if (second.equals("GBP")) {
                double Sum = num * 0.70854;
                System.out.printf("%.2f GBP", Sum);
            }
        }
        if (first.equals("BGN")) {
            if (second.equals("USD")) {
                double Sum = num / 1.79549;
                System.out.printf("%.2f USD", Sum);
            }
            if (second.equals("EUR")) {
                double Sum = num / 1.95583;
                System.out.printf("%.2f EUR", Sum);
            }
            if (second.equals("GPB")) {
                double Sum = num / 2.53405;
                System.out.printf("%.2f GPB", Sum);
            }
        }
        if (first.equals("EUR")) {
            if (second.equals("BGN")) {
                double Sum = num * 2.53405;
                System.out.printf("%.2f BGN", Sum);
            }
            if (second.equals("USD")) {
                double Sum = num * 1.08930;
                System.out.printf("%.2f USD", Sum);
            }
            if (second.equals("GBP")) {
                double Sum = num * 0.77181;
                System.out.printf("%.2f GBP", Sum);
            }
        }
        if (first.equals("GBP")) {
            if (second.equals("BGN")) {
                double Sum = num * 0.39462;
                System.out.printf("%.2f BGN", Sum);
            }
            if (second.equals("USD")) {
                double Sum = num * 2.53405 / 1.79549;
                System.out.printf("%.2f USD", Sum);
            }
            if (second.equals("EUR")) {
                double Sum = num * 0.77181;
                System.out.printf("%.2f EUR", Sum);
            }
        }
    }
}