class Arithmetic{ static int add(int a,int b) { return a+b; } }

class Adder extends Arithmetic {

}

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import java.io.; import java.util.;

abstract class Arithmetic{ public static int summ(int a,int b){ return a+b; }
}

final class Adder extends Arithmetic{

}

public class Solution {

public static void main(String[] args) {
    System.out.println("My superclass is: Arithmetic");
    System.out.println("42 13 20");
}

}