Sequence If Same and then Changes

=COUNTIF($B$1:$B1,B1)

A | B | C

=COUNTIF($B$1:$B1,B1) | |

1 | 123 |

2 | 123 |

3 | 123 |

1 | 322 |

2 | 322 |

1 | 555 |

2 | 555 |

3 | 555 |