Compiled from first.java
public class first extends java.lang.Object {
    public static void main(java.lang.String []);
    public first();

Method void main(java.lang.String [])
   0 bipush 19
   2 istore_1
   3 iload_1
   4 iload_1
   5 imul
   6 istore_1
   7 return

Method first()
   0 aload_0
   1 invokenonvirtual #3 <Method java.lang.Object.<init>()V>
   4 return

}