class Point {
int x, y;
void move(int dx, int dy) {
x += dx; y += dy; totalMoves++;
}
private static int totalMoves;
void printMoves() { System.out.println(totalMoves); }
}
class Point3d extends Point {
int z;
void move(int dx, int dy, int dz) {
super.move(dx, dy); z += dz; totalMoves++;
}
}