import java.io.*;

class ReadNum {
    public static void main(String args[]) {
        float sum = 0.0f;
        float num;
        String s = "";
        int i = 0; 
        
        DataInputStream input = new DataInputStream( System.in );
         
        try {
            while(true) {
                System.out.print( "Please input a number = " );
                System.out.flush();
                s = input.readLine();  // readFloat()メソッド 
                num = Float.valueOf(s).floatValue();  // 文字列を数値に変換
                System.out.println( "Input number = "+num );
                sum += num;
                ++i;
            }
        }
        catch (IOException e) {  // 例外：IOException
             System.out.println( "IO Error occuerd!" );
        }
        catch (NumberFormatException e) {  // 例外：NumberFormatException 
             System.out.println( "End of input" );
        }
        
        if ( i > 0 ) {
            System.out.println();
            System.out.println( "Sum = "+sum );
            System.out.println( "Average = "+sum/( (float) i ) );
        }
        else {
            System.out.println( "No number is input." );
        }

     }
} 
