h2. Date de intrare

The first line of the input file $christmasballs.in$ contains the only integer $N$ ($1 \le N \le 10^5$), the number of nodes of the tree.

The first line of the input file $christmas-balls.in$ contains the only integer $N$ ($1 \le N \le 10^5$), the number of nodes of the tree.

The second line contains $N$ integers $C_i$ ($0 &le; C_i < N$), the colors of each ball.

h2. Exemplu

table(example). |_. christmasballs.in |_. christmasballs.out |

table(example). |_. christmas-balls.in |_. christmas-balls.out |

| 8
1 2 0 2 0 0 1 1
0 0 1 1 3 4 4
| 3
|

table(example). |_. christmasballs.in |_. christmasballs.out |

table(example). |_. christmas-balls.in |_. christmas-balls.out |

| 5
0 1 1 0 0
0 1 2 3