import java.util.Scanner;

public class Centroid {
	Scanner in = new Scanner(System.in);
	
	void start() {
		int caseNumber = 1;
		while (true) {
			int n = in.nextInt();
			if (n < 0) return;
			float[] x = new float[n];
			float[] y = new float[n];
			float[] m = new float[n];
			for (int i = 0; i < n; i++) {
				x[i] = in.nextFloat();
				y[i] = in.nextFloat();
				m[i] = in.nextFloat();
			}
			process(caseNumber, x, y, m);
			caseNumber ++;
		}
	}
	
	void process(int caseNumber, float[] x, float[] y, float[] m) {
		float xNum = 0;
		float yNum = 0;
		float mTot = 0;
		for (int i = 0; i < x.length; i++) {
			xNum += x[i] * m[i];
			yNum += y[i] * m[i];
			mTot += m[i];
		}
		float x_c = xNum / mTot;
		float y_c = yNum / mTot;
		System.out.printf("Case %d: %.2f %.2f\n", caseNumber, x_c, y_c);
	}
	
	public static void main(String[] args) {
		new Centroid().start();
	}
}