import java.util.*;

public class GCentroid {
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);
		
		int i = 1;
		while(true)
		{
			boolean ret = go(in, i++);
			
			if(ret == false)
				break;
		}
	}
	
	static boolean go(Scanner in, int curCase)
	{
		int n = in.nextInt();
		
		if(n < 0)
			return false;
		
		
		double totalmass = 0;
		double xmoment = 0;
		double ymoment = 0;
		for(int i = 0; i < n; i++)
		{
			double x = in.nextDouble();
			double y = in.nextDouble();
			double m = in.nextDouble();
			
			totalmass += m;
			
			xmoment += x * m;
			ymoment += y * m;
		}
		
		String s = String.format("Case %d: %1.2f %1.2f", curCase, xmoment / totalmass, ymoment / totalmass);
		System.out.println(s);
		
		return true;
	}
}