import java.util.*;
public class Example 
{  
    public static void main (String args[ ])
    {
        System.out.println("請輸入若干個數，每輸入一個數回車確認");
        System.out.println("最后輸入一個非數字結束輸入操作");
        Scanner reader=new Scanner(System.in);
        double sum=0;
        int m=0;
        while(reader.hasNextDouble())
        {
            double x = reader.nextDouble();
            m=m+1;
            sum=sum+x;
           
        }
        System.out.printf("%d個數的和為%f\n",m,sum);
        System.out.printf("%d個數的平均值是%f\n",m,sum/m);    
    }
}