//compile time polymorphism
class Adder{
    public int add(int a, int b){
        return a+b;
    }
    public long add(long a, long b){
        return a+b;
    }
}
public class Main{
    public static void main(String[] args){
        Adder example=new Adder();
        System.out.println(example.add(5,10));
        System.out.println(example.add(15L,20L));
    }
}