main ()
                                {
                                    int i=0;
                                    for (i=0;i<20;i++)
                                    {
                                        switch (i){
                                                        case 0:
                                                            i+=5;
                                                        case 1:
                                                            i+=2;
                                                        case 5:
                                                            i+=5;
                                                        default:
                                                            i+=4;
                                                        break;
                                                    }
                                    }
                              }