import java.util.*;

public class dedos {
    public static void main( String[] args ){
        Scanner s = new Scanner(System.in);
        int ans = 0;
        for( int i = 0; i < 5; i++ ){
            int x = s.nextInt();
            ans = 2*ans + x; 
        }
        s.close();
        System.out.println(ans);
    }
}