import java.util.*;
import java.util.stream.*;
public class Main{
    public static void main(String[] args)
    {
        ArrayList<Integer> al=new ArrayList<>();
        al.add(7);
        al.add(90);
        al.add(4);
        al.add(18);
        al.add(3);
        System.out.println("List : "+al);
    
     Optional<Integer> sum=al.stream().reduce((x,y)->(x+y));
     if(sum.isPresent())
     System.out.println(" sum :"+sum.get());
     sum=al.stream().reduce((x,y)->(x*y));
     if(sum.isPresent())
     {
         System.out.println("product : "+sum.get());
     }
    }
}