// https://atcoder.jp/contests/apc001/tasks/apc001_e
//
#![allow(unused_imports)]
use std::io::*;
use std::io::Write;
use std::fmt::*;
use std::str::*;
use std::cmp::*;
use std::collections::*;

// Input macros.
// Original by tanakh: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
#[allow(unused_macros)]
macro_rules! input {
    (source = $s:expr, $($r:tt)*) => {
        let mut iter = $s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
    ($($r:tt)*) => {
        let s = {
            use std::io::Read;
            let mut s = String::new();
            std::io::stdin().read_to_string(&mut s).unwrap();
            s
        };
        let mut iter = s.split_whitespace();
        input_inner!{iter, $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! input_inner {
    ($iter:expr) => {};
    ($iter:expr, ) => {};

    ($iter:expr, $var:ident : $t:tt $($r:tt)*) => {
        let $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };

    ($iter:expr, mut $var:ident : $t:tt $($r:tt)*) => {
        let mut $var = read_value!($iter, $t);
        input_inner!{$iter $($r)*}
    };
}

#[allow(unused_macros)]
macro_rules! read_value {
    ($iter:expr, ( $($t:tt),* )) => {
        ( $(read_value!($iter, $t)),* )
    };

    ($iter:expr, [ $t:tt ; $len:expr ]) => {
        (0..$len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
    };

    ($iter:expr, [ next / $t:tt ]) => {
        {
            let len = read_value!($iter, usize);
            (0..len).map(|_| read_value!($iter, $t)).collect::<Vec<_>>()
        }
    };

    ($iter:expr, switch) => {
        {
            let ty = read_value!($iter, i32);
            if ty == 1 {
                vec![ty, read_value!($iter, i32), read_value!($iter, i32)]
            } else if ty == 2 {
                vec![ty, read_value!($iter, i32)]
            } else {
                vec![ty, read_value!($iter, i32)]
            }
        }
    };

    ($iter:expr, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };

    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };

    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}

#[allow(unused_macros)]
macro_rules! read_line {
    ($t:tt) => {
        {
            let mut s = String::new();
            std::io::stdin().read_line(&mut s).unwrap();
            s.trim_right().parse::<$t>().unwrap()
        }
    }
}

#[allow(unused_macros)]
macro_rules! dvec {
    ($t:expr ; $len:expr) => {
        vec![$t; $len]
    };

    ($t:expr ; $len:expr, $($rest:expr),*) => {
        vec![dvec!($t; $($rest),*); $len]
    };
}

#[allow(unused_macros)]
macro_rules! ifv {
    ($t:expr, $a:expr, $b: expr) => {
        if $t { $a } else { $b }
    }
}

#[allow(unused_macros)]
macro_rules! fill {
    ($t:expr, $v:expr) => {
        for i in 0..$t.len() {
            $t[i] = $v;
        }
    };
}

#[allow(unused_macros)]
macro_rules! join {
    ($t:expr, $glue:expr) => {
        $t.into_iter().map(|w| w.to_string()).collect::<Vec<_>>().join($glue)
    };
}

#[allow(unused_macros)]
macro_rules! debug {
    ($($a:expr),*) => {
        println!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
    }
}

// ===

const INF: usize = 1e9 as usize;

type Graph = Vec<Vec<usize>>;

fn dfs(graph: &Graph, now: usize, parent: Option<usize>) -> Vec<usize> {
    let mut cn = 0;
    let mut cres = vec![];
    for &to in &graph[now] {
        if Some(to) == parent {
            continue;
        }
        cn += 1;
        cres.push(dfs(graph, to, Some(now)));
    }
    if cn == 0 {
        return vec![0, 1];
    }
    if cn == 1 {
        return cres[0].clone();
    }

    let mut ret = dvec!(INF; cn+1, 2);
    ret[0][0] = 0;
    for i in 0..cn {
        for f in 0..2 {
            let base = ret[i][f];
            if f == 0 {
                ret[i+1][1] = min(ret[i+1][1], base+cres[i][0]);
            }
            ret[i+1][f] = min(ret[i+1][f], base+cres[i][1]);
        }
    }
    vec![INF, min(ret[cn][0], ret[cn][1])]
}

fn solve(g: &Graph) -> usize {
    let n = g.len();
    let mut has3 = false;
    for i in 0..n {
        has3 |= g[i].len() >= 3;
    }
    if !has3 {
        return 1;
    }

    let mut root = 0;
    for i in 0..n {
        if g[i].len() >= 3 {
            root = i;
            break;
        }
    }

    let a = dfs(g, root, None);
    a[1]
}


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

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

    println!("{}", solve(&g));
}


Measured memory_bytes: 27516