/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
 
abstract class Exp { int f() { return 1; } }
class Add extends Exp {
Exp a1, a2;
Add(Exp a1, Exp a2) { this.a1 = a1; this.a2 = a2; }
int f() { return a1.f() + a2.f(); }
}
class Mult extends Exp {
Exp a1, a2;
Mult(Exp a1, Exp a2) { this.a1 = a1; this.a2 = a2; }
int f() { return a1.f() + a2.f(); }
}
class Const extends Exp {
int v;
Const(int v) { this.v = v; }
}
class Test {
public static void main(String[] args) {
Exp e = new Add(new Mult(new Const(2), new Const(3)), new Const(4));
System.out.println(e.f());
}
}

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