题解 | #计算平均成绩#

import java.util.Scanner;
public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int sum = 0;
        while(sc.hasNextInt()) {
            sum += sc.nextInt();
        }
        System.out.println(String.format("%.1f",sum*1.0/5));
    }
}