p174

import java.util.*;
public class E {
    public static void main (String args[ ]){
      Scanner reader = new Scanner(System.in);
      double sum = 0;
       int m = 0;
       while(reader.hasNextDouble()){
           double x = reader.nextDouble();
           assert x< 100:"数据不合理";
           m = m+1;
           sum = sum+x;
       }
       System.out.printf("%d个数的和为%f\n",m,sum);
       System.out.printf("%d个数的平均值是%f\n",m,sum/m); 
    }
}