#include<bits/stdc++.h>

using namespace std;

#define int long long
#define double long double
#define vi vector<int>
#define vvi vector<vi>

#define pii pair<int,int>
#define piii pair<pii,int>
#define viii vector<piii>
#define vii vector<pii>

#define fi first
#define se second

#define pb push_back
const double eps=1e-12;

int n;
vvi con;

int trywithroot(int ac, int ant, int r){
    //cerr << ' ' << ac << ' ' << ant << endl;
    vi vec;
    for(int y:con[ac]){
        if (y!=ant) vec.pb(trywithroot(y,ac,r));
    }
    sort(vec.begin(),vec.end());

    int res=1;
    for (int x:vec) if (res>=x) res+=x;
 
    return res;
}

bool tryroot(int r){
    cerr << r << endl;
    return trywithroot(r,-1,r)==n;
}

bool ans=0;

int rec(int ac, int ant){
    //cerr << ac << ' ' << ant << endl;
    vi vec;
    for (int y:con[ac]) if (y!=ant) vec.pb(rec(y,ac));

    int s,m;
    s=m=0;
    for (int y:vec){
        s+=y;
        m=max(y,m);
    }

    if (m<=n/2+2  && n-s<=n/2+2) ans= ans || tryroot(ac);
    return s+1;
}

signed main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    
    cin >> n;
    con=vvi(n);
    for (int i=0;i<n-1;i++){
        int a,b;
        cin >> a >> b;
        a--;b--;
        con[a].pb(b);
        con[b].pb(a);
    }
    
    rec(0,-1);
    
    if (ans) cout << "YES\n";
    else cout << "NO\n";
}