use proconio::{input, marker::Usize1};

fn main() {
    input! {
        n:usize,
        uv:[(Usize1,Usize1);n-1],
    }

    let mut g = vec![vec![]; n];
    for &(u, v) in uv.iter() {
        g[u].push(v);
        g[v].push(u);
    }

    let mut dp = vec![[0; 2]; n];
    for i in 0..n {
        dp[i][1] = 1;
    }

    f(0, n, &g, &mut dp);

    let ans = dp[0][0].max(dp[0][1]);
    println!("{}", ans);
}

fn f(crr: usize, pre: usize, g: &Vec<Vec<usize>>, dp: &mut Vec<[usize; 2]>) {
    for &nxt in g[crr].iter() {
        if nxt == pre {
            continue;
        }
        f(nxt, crr, g, dp);
        dp[crr][0] += dp[nxt][0].max(dp[nxt][1]);
        dp[crr][1] += dp[nxt][0].max(dp[nxt][1] - 1);
    }
}