fn main() {
    let mut n = String::new();
    std::io::stdin().read_line(&mut n).ok();
    let n: usize = n.trim().parse().unwrap();
    let mut r = String::new();
    std::io::stdin().read_line(&mut r).ok();
    let r: Vec<usize> = r.trim().split_whitespace().map(|s| s.parse::<usize>().unwrap()-1).collect();

    let mut cnt = 0usize;
    let mut idx = 0usize;
    while idx != n-1 {
        cnt += 1;
        idx = r[idx];
    }
    println!("{}", cnt);
}