What will be the output of the following C# code snippet?

class UnsafeCode
{
    unsafe static void Main()
    {
        int* a;
        int a1 = 10;
        int b1;
        b1 = *&a1;
        a = &b1;
        {
            Console.WriteLine(*a);
            Console.ReadLine();
        }
    }
}