// C# version of a Prime Number Finder
// Build under Mono .28
// haplo@mindstab.net

using System;

class Primes {
	private static void Main(String[] argv)
	{
		int MAX=0;
		if(argv.Length >= 1) {
			try {
				MAX = (int)Convert.ToDouble(argv[0]); 
			} catch {
				Console.WriteLine("Invalid Max Num");
				return;
			}

		} else {
			Console.WriteLine("Useage: primes.exe [Max Num]");
			return;
		}
		
		for(int cnt = 3;  cnt <= MAX; cnt+= 2)
		{
			int test = (int) Math.Sqrt(cnt);
			int isPrime = 1;
			for(int i=3; i <= test; i+=2)
			{
				isPrime = cnt % i;
				if( isPrime == 0) {
					break;
				}
			}
			if(isPrime != 0)
			{
				Console.WriteLine(cnt);
			}
		}
	}
}