content: package v111;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.util.StringTokenizer;
  
  public class TrashRemoval_UVa11111 {
  	
  	static final double EPS = 1e-9, INF = 1e9;
  	
  	public static void main(String[] args) throws IOException {
  		
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  		
  		int k = 1;
  		while(true)
  		{
  			int n = sc.nextInt();
  			if(n == 0) break;
  			
  			Point[] p = new Point[n];
  			for(int i = 0; i < n; i++)
  				p[i] = new Point(sc.nextInt(), sc.nextInt());
  			p = CH(p);
  			
  			double ans = Math.ceil(findMin(p) * 100) / 100.0;
  			out.format("Case %d: %.2f\n", k++, ans);
  		}
  		out.flush();
  	}
  	
  	static double findMin(Point[] p)
  	{
  		double min = INF;
  		for(int i = 0; i < p.length - 1; i++)
  		{
  			Point a = p[i], b = p[i+1];
  			double max = 0;
  			for(int j = 0; j < p.length - 1; j++)
  				max = Math.max(max, distToLine(p[j], a, b));
  			min = Math.min(max, min);
  		}
  		return min;
  	}
  	
  	static double distToLine(Point p, Point a, Point b) //distance between point p and a line defined by points a, b (a != b)
  	{
  		// formula: c = a + u * ab
  		Vector ap = new Vector(a, p), ab = new Vector(a, b);
  		double u = ap.dot(ab) / ab.norm2();
  		Point c = a.translate(ab.scale(u)); 
  		return p.dist(c);
  	}
  	
  	static boolean ccw(Point a, Point b, Point c)
  	{
  		return new Vector(a, b).cross(new Vector(a, c)) > EPS;
  	}
  	
  	static class Point implements Comparable<Point>
  	{
  		double x, y;
  		
  		Point(double a, double b) { x = a; y = b; }
  		
  		public int compareTo(Point p)
  		{
  			if(Math.abs(x - p.x) > EPS) return x > p.x ? 1 : -1;
  			if(Math.abs(y - p.y) > EPS) return y > p.y ? 1 : -1;
  			return 0;
  		}
  		
  		double dist(Point p)
  		{
  			return Math.sqrt((p.x - x) * (p.x - x) + (p.y - y) * (p.y - y));
  		}
  		
  		Point translate(Vector v)
  		{
  			return new Point(x + v.x, y + v.y);
  		}
  	}
  	
  	static class Vector
  	{
  		double x, y;
  		
  		Vector(Point a, Point b) { x = b.x - a.x; y = b.y - a.y; }
  		
  		Vector(double a, double b) { x = a; y = b; }
  		
  		double cross(Vector v) { return x * v.y - y * v.x; }
  		
  		double dot(Vector v) { return x * v.x + y * v.y; }
  		
  		double norm2() { return x * x + y * y; }
  		
  		Vector scale(double s) { return new Vector(x * s, y * s); }
  	}
  	
  	static Point[] CH(Point[] points)
  	{
  		int n = points.length;
  		Arrays.sort(points);
  		Point[] ans = new Point[n<<1];
  		int size = 0, start = 0;
  		
  		for(int i = 0; i < n; i++)
  		{
  			Point p = points[i];
  			while(size - start >= 2 && !ccw(ans[size-2], ans[size-1], p))	size--;
  			ans[size++] = p;
  		}
  		start = --size;
  	 
  		for(int i = n-1 ; i >= 0 ; i--)
  		{
  			Point p = points[i];
  			while(size - start >= 2 && !ccw(ans[size-2], ans[size-1], p))	size--;
  			ans[size++] = p; 
  		}	
  		return Arrays.copyOf(ans, size);
  	}
  
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  		
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  		
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  			
  		public boolean ready() throws IOException {return br.ready();}
  
  
  	}
  }
  