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using System.Linq;
using System.Threading.Tasks;
 
public class Program
{
	public static void Main(string[] args)
	{
		for (int i=0; i<20; i++)
			System.Console.WriteLine(fibonacci(i));
	}
 
	private static ulong fibonacci(int n)
	{
	    ulong u = 0;
	    ulong v = 1;
	    ulong t;
#if true
	    Parallel.For(2, n + 1, i =>
#else
		Enumerable.Range(2, n+1).ToList().ForEach(i =>
#endif
	    {
	        t = u + v;
	        u = v;
	        v = t;
	    });
	    return v;
	}
}
 

prog.cs(2,24): error CS0234: The type or namespace name `Tasks' does not exist in the namespace `System.Threading'. Are you missing an assembly reference?
Compilation failed: 1 error(s), 0 warnings

Standard output is empty