use proconio::input;
use proconio::marker::Usize1;

fn main() {
    input! {
        n: usize,
        edges: [(Usize1, Usize1); n - 1],
    }
    let mut g = vec![Vec::new(); n];
    for &(i, j) in &edges {
        g[i].push(j);
        g[j].push(i);
    }
    let mut sorted = Vec::new();
    let mut parent = vec![usize::MAX; n];
    let mut stack = vec![0];
    while let Some(i) = stack.pop() {
        sorted.push(i);
        g[i].retain(|&j| j != parent[i]);
        for &j in &g[i] {
            stack.push(j);
            parent[j] = i;
        }
    }

    let dp = tree_dp(&O {}, &g, &sorted);
    let ans = dp[0].retain.max(dp[0].remove);
    println!("{ans}");
}

#[derive(Debug, Clone, PartialEq, Default)]
struct Value {
    retain: usize,
    remove: usize,
}

#[derive(Debug, Clone, PartialEq, Default)]
struct Acc {
    any_sum: usize,
    remove_sum: usize,
}

struct O {}
impl Op for O {
    type Acc = Acc;
    type Value = Value;

    fn f(&self, value: &Self::Value, _index: usize) -> Self::Acc {
        Self::Acc {
            any_sum: value.retain.max(value.remove),
            remove_sum: value.remove,
        }
    }

    fn mul(&self, lhs: &Self::Acc, rhs: &Self::Acc, _parent: usize) -> Self::Acc {
        Self::Acc {
            any_sum: lhs.any_sum + rhs.any_sum,
            remove_sum: lhs.remove_sum + rhs.remove_sum,
        }
    }

    fn identity(&self, _parent: usize) -> Self::Acc {
        Self::Acc {
            any_sum: 0,
            remove_sum: 0,
        }
    }

    fn g(&self, acc: &Self::Acc, _index: usize) -> Self::Value {
        Self::Value {
            retain: 1 + acc.remove_sum,
            remove: acc.any_sum,
        }
    }
}

pub trait Op {
    type Value: Default + Clone;
    type Acc: Default + Clone;

    fn f(&self, value: &Self::Value, index: usize) -> Self::Acc;
    fn mul(&self, lhs: &Self::Acc, rhs: &Self::Acc, parent: usize) -> Self::Acc;
    fn identity(&self, parent: usize) -> Self::Acc;
    fn g(&self, acc: &Self::Acc, index: usize) -> Self::Value;
}

pub fn tree_dp<O: Op>(o: &O, g: &[Vec<usize>], sorted: &[usize]) -> Vec<O::Value> {
    let mut dp = vec![O::Value::default(); g.len()];
    for &i in sorted.iter().rev() {
        dp[i] = o.g(
            &g[i]
                .iter()
                .fold(o.identity(i), |acc, &j| o.mul(&acc, &o.f(&dp[j], j), i)),
            i,
        );
    }
    dp
}