import java.text.DecimalFormat;
import java.util.Scanner;


public class mass {

	public static void main(String[] args) {
		new mass().go();

	}
	public static class point{
		int x;
		int y;
		int mass;
	}
	private void go() {
		// TODO Auto-generated method stub
		Scanner in = new Scanner(System.in);
		int N = in.nextInt();
		DecimalFormat df = new DecimalFormat("###.00");
		int no = 1;
		while(N>-1){
			double weighted_xs = 0;
			double weighted_ys = 0;
			double masses = 0;
			for(int i =0;i<N;i++){
				point lala = new point();
				lala.x = in.nextInt();
				lala.y = in.nextInt();
				lala.mass = in.nextInt();
				weighted_xs += lala.x * lala.mass;
				weighted_ys += lala.y * lala.mass;
				masses += lala.mass;
			}
			double x = weighted_xs/masses;
			double y = weighted_ys/masses;
			String newx = df.format(x);
			String newy = df.format(y);
			System.out.printf("Case %d: %s %s\n",no,newx,newy);
			N = in.nextInt();
			no +=1;
			
		}
	}

}