import java.util.Scanner;


public class CB {

	Scanner in = new Scanner(System.in);
	
	
	public double getCenterX(int[] y, int[] m){
		
		double num=0;
		double den=0;
		for (int i=0; i<y.length; i++){
			num+=(y[i]*m[i]);
			den+=m[i];
		}
		if (den==0){return 0;}
		return num/den;
	}
	
	public double getCenterY(int[] x, int[] m){
		
		double num=0;
		double den=0;
		for (int i=0;i<x.length; i++){
			num+=(x[i]*m[i]);
			den+=m[i];
		}
		if (den==0) return 0;
		return num/den;
	}
	
	public void go(){
		
		int iter=1;
		
		while (true){
			int curr = in.nextInt();
			if (curr<0) break;
			int[] x = new int[curr];
			int[] y = new int[curr];
			int[] m = new int[curr];
			for (int i=0; i<curr; i++){
				x[i]=in.nextInt();
				y[i]=in.nextInt();
				m[i]=in.nextInt();
			}
			double xcent = getCenterX(x, m);
			double ycent = getCenterY(y,m);
			System.out.printf("Case "+iter+": "+"%.2f"+" "+"%.2f\n", xcent, ycent);
			iter++;
		}
		
		
	}
	
	public static void main(String[] args){
		CB cb = new CB();
		cb.go();
	}
	
}