题解思路

import java.util.Scanner;

public class Main{
    
    public static void main(String[] args){
        Scanner sin = new Scanner(System.in);
        double sum = 0.0;
        for(int i=0;i<5;i++){
//             double d = sin.nextDouble();
            sum += sin.nextDouble();
        }
        double d = sum / 5;
        System.out.println(String.format("%.2f",d));
    }
}