class Main {
main () { return new A().mt( new MyInteger(), new MyInteger() , new MyInteger() );  }
}


class A  {
mt(x,y,z) { return x.sub(y).add(z); }
}

interface if1<A,B> {
mt(a,b,c);
}


class MyInteger {
   a = new MyInteger();
   b;

   mt(a) {
        return new MyInteger();
   }
}

class MyList {

}