using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Aylin Nava");

        int sub,age,year,nation,total,r;

        string name;

        Console.WriteLine("UNIVERSITY");

        Console.WriteLine("What´s your name? ");

        name=Console.ReadLine();

        Console.WriteLine("How old are you? ");

        age=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("In which year did you entry at the university? ");

        year=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("Are you Mexican: \n1.-YES\n2.-NO ");

        nation=Convert.ToInt32(Console.ReadLine());

        Console.WriteLine("How many subjects are you going to choose?");

        sub=Convert.ToInt32(Console.ReadLine());

        if(year>2015 && nation==1){

        total=sub*50;

        Console.WriteLine("The total amount to pay is: {0}",total);

        }else if(year<=2015 && nation==2){

        r=sub*5;

        total=r+(sub*30);

        Console.WriteLine("The total amount to pay is: {0}",total);

        }else if(year<=2015){

        total=sub*30; 

        Console.WriteLine("The total amount to pay is: {0}",total);

        }

    }

}

​