static void Main(string[] args)
        {
            TestNumber();
        }
        static void TestNumber()
        {
            long num = 500000000;
            long count = 0;
            Console.WriteLine(DateTime.Now.ToString());
            for(var i=1;i<num;i++)
            {
                if(i%2==0)
                {
                    count++;
                }
            }
            Console.WriteLine(DateTime.Now.ToString());
            Console.WriteLine(count);
            Console.ReadKey();
        }

func main() {
	TestNumber2()
}

func TestNumber2() {
	var number int64
	number = 500000000
	var n int64
	var i int64
	fmt.Println(time.Now())
	for i = 1; i <= number; i++ {
		if i%2 == 0 {
			n = n + 1
		}
	}
	fmt.Println(time.Now().String())
	fmt.Println(n)
}