import java.util.*;
import java.io.*;
public class chengjiDemo {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int y1=sc.nextInt();
        int y2= sc.nextInt();
        int y3=sc.nextInt();
        int all= (int) (y1*0.2+y2*0.3+y3*0.5);
        System.out.println(all);
    }

}

} 为什么，没人用Java，我这里哪错了xdm，idea里没一点问题啊