Simple Example Class and constructor

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace NiceTry
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("----Nhap vao nguyen lieu va km-------");
            Console.Write("Nguyen lieu : ");
            int nguyenlieu = Convert.ToInt32(Console.ReadLine());
            Console.Write("Km : ");
            int km = Convert.ToInt32(Console.ReadLine());
            xe abc = new xe(nguyenlieu,km);
            Console.WriteLine("So nguyen lieu can su dung : {0}", abc.tieuthu());
            Console.ReadKey();
        }
    }
    class xe
    {
        public xe()
        {

        }
        public int nhienlieu { get; set; }
        public int km { get; set; }
        public xe(int nhienlieu,int km)
        {
            this.nhienlieu = nhienlieu;
            this.km = km;
        }
        public long tieuthu()
        {
            return (Convert.ToInt64(this.nhienlieu * this.km));
        }
    }
}