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/**
 * @author ivanov-void
 */
public class Main {
	/**
	 * @param argc
	 */
    public static void main(String[] argc) {    	
		double a1[][],a2[][],a3[][];
		
		a1 = reforming("...........");
		a2 = reforming("...............");
		a3 = devide(a1, a2);
		
		System.out.println(getAverage(a3));
    }
    /**
     * 
     * @param fN
     * @return
     * @throws IOException
     */
    public static String[] readf(String fN) throws IOException {
        FileReader fR = new FileReader(fN);
        BufferedReader bR = new BufferedReader(fR);
        List<String> l = new ArrayList<String>();
        
        String s = null;
        while((null != (s = bR.readLine())))
            l.add(s+" ");            
        
        bR.close();
        return l.toArray(new String[l.size()]);
    }
    /**'
     * 
     * @param a
     * @return
     */
    public static double getAverage(double[][] a) {
    	double s = 0;
    	int c = 0;
    	for(int i = -1; ++i < a.length;)
        	for(int j = -1; ++j < a[i].length; s = s + a[i][j], c++);        		        		
    	
    	return s/ c;
    }
    /**
     * 
     * @param fN
     * @return
     */
    public static double[][] reforming(String fN) {
    	String[] l = null;
		try {
			l = readf(fN);
		} catch (IOException ioe) {
			ioe.printStackTrace();
		}
		int s = l.length;
		double a[][] = new double[s][s];
   		for(int i = -1; ++i < s;) {    			    			
    		StringTokenizer st = new StringTokenizer(l[i], "\t\n\r,. ");  
    		
    		int lSize = st.countTokens();
    		for(int j = -1; ++j < lSize;) {
    			String token = st.nextToken();
    			a[i][j] = Double.parseDouble(token); 
    		}           		
		}
   		return a;
    }
    /**
     * 
     * @param a1
     * @param a2
     * @return
     */
    public static double[][] devide(double a1[][], double a2[][]) {
    	double[][] a3 = new double[a1.length][a1.length];
     	for(int i = -1; ++i < a1.length;)
        	for(int j = -1; ++j < a1[i].length; a3[i][j] = a1[i][j] / a2[i][j]);        			
     	return a3;
    }     	    
}
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