{"problem":{"name":"Ancestor","description":{"content":"There are $N$ people, called Person $1$, Person $2$, $\\ldots$, Person $N$. The parent of Person $i$ $(2 \\le i \\le N)$ is Person $P_i$. Here, it is guaranteed that $P_i < i$. How many generations away ","description_type":"Markdown"},"platform":"AtCoder","limit":{"time_limit":2000,"memory_limit":262144},"difficulty":"None","is_remote":true,"is_sync":true,"sync_url":null,"sign":"abc263_b"},"statements":[{"statement_type":"Markdown","content":"There are $N$ people, called Person $1$, Person $2$, $\\ldots$, Person $N$.\nThe parent of Person $i$ $(2 \\le i \\le N)$ is Person $P_i$. Here, it is guaranteed that $P_i < i$.\nHow many generations away from Person $N$ is Person $1$?\n\n## Constraints\n\n*   $2 \\le N \\le 50$\n*   $1 \\le P_i < i(2 \\le i \\le N)$\n*   All values in input are integers.\n\n## Input\n\nInput is given from Standard Input in the following format:\n\n$N$\n$P_2$ $P_3$ $\\dots$ $P_N$\n\n[samples]","is_translate":false,"language":"English"}],"meta":{"iden":"abc263_b","tags":[],"sample_group":[["3\n1 2","2\n\nPerson $2$ is a parent of Person $3$, and thus is one generation away from Person $3$.\nPerson $1$ is a parent of Person $2$, and thus is two generations away from Person $3$.\nTherefore, the answer is $2$."],["10\n1 2 3 4 5 6 7 8 9","9"]],"created_at":"2026-03-03 11:01:14"}}