import java.util.*;
    public class Result
    {
        public static double sumOfList(List list)
        {
            double var = 0.0;
            for (Number num : list)
                var += num.doubleValue();
            return var;
        }
        public static void main(String args[])
        {
            List ListObject = Arrays.asList(10, 20, 30);
            System.out.println(sumOfList(ListObject));
        }
    }