题解 | #KiKi算期末成绩#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String str = in.nextLine();
        String []num = str.split(" ");
        double sum = Double.parseDouble(num[0])*0.2+ Double.parseDouble(num[1])*0.1+
         Double.parseDouble(num[2])*0.2+ Double.parseDouble(num[3])*0.5;
         System.out.printf("%.1f",sum);
       
    }
}