using System;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Employee[] employees = new Employee[10];

        Administrator admin = new Administrator(1000, 0.5);

        Engineer engineer = new Engineer(500, 0.3);

        Worker worker = new Worker(300, 0.2);

        Trainee trainee = new Trainee(200, 0.1);

        employees[0] = admin;

        employees[1] = engineer;

        employees[3] = worker;

        employees[4] = trainee;

        double allSalary = 0;

        foreach(Employee employee in employees) {

            allSalary += employee.calculateSalary();

        }

        Console.WriteLine(allSalary);

        Console.ReadLine();

    }

}

​

abstract class Employee {

    protected double salary;

    protected double rate;

    public abstract double calculateSalary();

}

​

class Administrator : Employee {

    public Administrator (double salary, double rate) {

        this.salary = salary;

        this.rate = rate;

    }

    public override double calculateSalary() {

        return salary * rate + 100;

    }

}

​

class Engineer : Employee {

    public Engineer (double salary, double rate) {

        this.salary = salary;

        this.rate = rate;

    }

    public override double calculateSalary() {

        return this.salary * this.rate + 50;

    }

}

​

class Worker : Employee {

    public Worker (double salary, double rate) {

        this.salary = salary;

        this.rate = rate;

    }

    public override double calculateSalary() {

        return this.salary * this.rate + 30;

    }

}

​

class Trainee : Employee {

    public Trainee (double salary, double rate) {

        this.salary = salary;

        this.rate = rate;

    }

    public override double calculateSalary() {

        return this.salary * this.rate + 10;

    }

}

​

​