import java.util.Scanner;


public class centroid {
	static Scanner in=new Scanner(System.in);
	public static void main(String[] args) {
		int i=0;
		while(true){
			i++;
			int n=in.nextInt();
			if(n<0) break;
			int[] x =new int[n];
			int[] y =new int[n];
			int[] m =new int[n];
			long mass =0;
			long mx =0;
			long my=0;
			for(int j=0;j<n;j++){
				x[j] = in.nextInt();
				y[j] = in.nextInt();
				m[j] = in.nextInt();
				mass=mass+m[j];
				mx = mx + m[j]*x[j];
				my = my + m[j]*y[j];
			}
			double X = (double)mx/mass;
			double Y = (double)my/mass;
			System.out.printf("Case %d: %.2f %.2f\n", i,X,Y);
		}
	}
}