import 'dart:io';

void main(){

  List<Map<String, double>> incomeList = [];
  List<Map<String, double>> expenseList = [];

  while(true){

    int choice = int.parse(stdin.readLineSync()!);

    if(choice == 1){

      String desc = stdin.readLineSync()!;
      double amount = double.parse(stdin.readLineSync()!);

      if(amount >= 0){
        incomeList.add({desc: amount});
        print("Income added!");
      } else {
        print("Invalid amount");
      }
    }

    else if(choice == 2){

      String desc = stdin.readLineSync()!;
      double amount = double.parse(stdin.readLineSync()!);

      if(amount >= 0){
        expenseList.add({desc: amount});
        print("Expense added!");
      } else {
        print("Invalid amount");
      }
    }

    else if(choice == 3){

      double totalIncome = 0;
      double totalExpense = 0;

      for(var item in incomeList){
        totalIncome += item.values.first;
      }

      for(var item in expenseList){
        totalExpense += item.values.first;
      }

      double net = totalIncome - totalExpense;

      print("Total income: $totalIncome");
      print("Total expenses: $totalExpense");

      if(net >= 0){
        print("Net profit: $net");
      } else {
        print("Net loss: ${net.abs()}");
      }

      double tax = net > 0 ? net * 0.15 : 0;
      if(tax > 0){
        print("Tax to be paid: $tax");
      }
    }

    else if(choice == 4){
      break;
    }
  }
}