// ---------- begin Run Length Encoding ----------
fn run_length_encoding<T: Clone + Eq>(a: &[T]) -> Vec<(T, usize)> {
    let mut a = a.iter().map(|a| (a.clone(), 1)).collect::<Vec<_>>();
    a.dedup_by(|a, b| {
        a.0 == b.0 && {
            b.1 += a.1;
            true
        }
    });
    a
}
// ---------- end Run Length Encoding ----------
// ---------- begin input macro ----------
// reference: https://qiita.com/tanakh/items/0ba42c7ca36cd29d0ac8
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)*}
    };
}

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)*}
    };
}

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, chars) => {
        read_value!($iter, String).chars().collect::<Vec<char>>()
    };
    ($iter:expr, bytes) => {
        read_value!($iter, String).bytes().collect::<Vec<u8>>()
    };
    ($iter:expr, usize1) => {
        read_value!($iter, usize) - 1
    };
    ($iter:expr, $t:ty) => {
        $iter.next().unwrap().parse::<$t>().expect("Parse error")
    };
}
// ---------- end input macro ----------

fn run() {
    input! {
        n: usize,
        e: [(usize1, usize1); n - 1],
    }
    let mut g = vec![vec![]; n];
    for (a, b) in e {
        g[a].push(b);
        g[b].push(a);
    }
    if g.iter().filter(|g| g.len() > 2).count() > 1 {
        println!("No");
        return;
    }
    if n <= 3 {
        println!("Yes");
        return;
    }
    let mut ans = "No";
    if let Some(x) = g.iter().position(|g| g.len() > 2) {
        let mut topo = vec![x];
        let mut dp = vec![n; n];
        dp[x] = 0;
        for i in 0..n {
            let v = topo[i];
            for &u in g[v].iter() {
                if dp[u] == n {
                    dp[u] = dp[v] + 1;
                    topo.push(u);
                }
            }
        }
        dp.sort();
        dp.remove(0);
        let z = run_length_encoding(&dp);
        let x = z[0].1;
        if z.iter().all(|dp| dp.1 == x) {
            ans = "Yes";
        }
    } else {
        ans = "Yes";
    }
    println!("{}", ans);
}

fn main() {
    run();
}