void g0(), g1(), g2(), g3(), g4(), g5(), g6();

int f(int n) {
    switch(n) {
      default:
	g0();
	break;
      case -1:
	g1();
	break;
      case -2:
	g2();
	break;
      case -3:
	g3();
	break;
      case -4:
	g4();
	break;
      case -5:
	g5();
	break;
      case -6:
	g6();
	break;
    }
    return 0;
}