fn main() {
    let n: usize = io::input();
    let mut g = vec![vec![]; n];
    for _ in 0..n - 1 {
        let (u, v): (usize, usize) = io::input();
        let (u, v) = (u - 1, v - 1);
        g[u].push(v);
        g[v].push(u);
    }
    let mut stack = vec![0];
    let mut ord = Vec::new();
    let mut parent = vec![usize::MAX; n];
    while let Some(x) = stack.pop() {
        ord.push(x);
        for &y in &g[x] {
            if y == parent[x] {
                continue;
            }
            parent[y] = x;
            stack.push(y);
        }
    }
    let mut dp = vec![(0, 0); n];
    for &x in ord.iter().rev() {
        for &y in &g[x] {
            if y == parent[x] {
                continue;
            }
            dp[x].0 += dp[y].1;
            dp[x].1 += dp[y].0.max(dp[y].1);
        }
        dp[x].0 += 1;
    }
    let ans = dp[0].0.max(dp[0].1);
    println!("{}", ans);
}
// io {{{
// https://ngtkana.github.io/ac-adapter-rs/io/index.html

#[allow(dead_code)]
mod io {
    use std::cell::Cell;
    use std::io::stdin;
    use std::io::BufRead;
    use std::io::BufReader;
    use std::io::Lines;
    use std::io::Stdin;
    use std::sync::Mutex;
    use std::sync::Once;
    pub fn input<T: ParseLine>() -> T {
        ParseLine::parse_line(&line())
    }
    pub trait ParseLine {
        fn parse_line(s: &str) -> Self;
    }
    macro_rules! impl_parse_line {
        ($($t:ty),*) => {
            $(impl ParseLine for $t {
                fn parse_line(s: &str) -> Self {
                    s.parse().unwrap()
                }
            })*
        };
    }
    impl_parse_line!(u8, u16, u32, u64, u128, usize, i8, i16, i32, i64, i128, isize, String, char);
    macro_rules! impl_parse_line_tuple {
        ($($t:ident),*) => {
            impl<$($t: ParseLine),*> ParseLine for ($($t,)*) {
                fn parse_line(s: &str) -> Self {
                    let mut s = s.split_whitespace();
                    ($($t::parse_line(s.next().unwrap()),)*)
                }
            }
        };
    }
    impl_parse_line_tuple!(T0, T1);
    impl_parse_line_tuple!(T0, T1, T2);
    impl_parse_line_tuple!(T0, T1, T2, T3);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4, T5);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4, T5, T6);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4, T5, T6, T7);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4, T5, T6, T7, T8);
    impl_parse_line_tuple!(T0, T1, T2, T3, T4, T5, T6, T7, T8, T9);
    impl<T: ParseLine> ParseLine for Vec<T> {
        fn parse_line(s: &str) -> Self {
            s.split_whitespace().map(T::parse_line).collect()
        }
    }
    static ONCE: Once = Once::new();
    type Server = Mutex<Lines<BufReader<Stdin>>>;
    struct Lazy(Cell<Option<Server>>);
    unsafe impl Sync for Lazy {}
    fn line() -> String {
        static SYNCER: Lazy = Lazy(Cell::new(None));
        ONCE.call_once(|| {
            SYNCER
                .0
                .set(Some(Mutex::new(BufReader::new(stdin()).lines())));
        });
        unsafe {
            (*SYNCER.0.as_ptr())
                .as_ref()
                .unwrap()
                .lock()
                .unwrap()
                .next()
                .unwrap()
                .unwrap()
        }
    }
}
// }}}