from collections import Counter
N = int(input())
AB = [list(map(int,input().split())) for _ in range(N-1)]
D = [0] * N
E = [[] for _ in range(N)]
for a, b in AB:
    a -= 1
    b -= 1
    E[a].append(b)
    E[b].append(a)
    D[a] += 1
    D[b] += 1
C = Counter(D)
'''
次以外の時はNO
 次数1の数2で残り全部2の時
 次数2の数が次数1の数の定数倍で次数が次数1の数である頂点がある
'''
def check(x,x1):
    nv = [1] * N
    nv[x] = 0
    Q = [x]
    Q2 = []
    while Q:
        while Q:
            x = Q.pop()
            for y in E[x]:
                if nv[y]:
                    nv[y] = 0
                    Q2.append(y)
        if not(len(Q2) == x1 or len(Q2) == 0):
            return False
        Q,Q2 = Q2,Q
    return True

x1 = C[1]
x2 = C[2]
NC = len(C)
f = False
if x1 == 2:
    if x2 == 0:
        if NC == 1:
            f = True
    else:
        if NC == 2:
            f = True
else:
    if x2 == 0:
        if C[x1] == 1 and NC == 2:
            f = True
    elif x2 % x1 == 0:
        if C[x1] == 1 and NC == 3:
            st = D.index(x1)
            f = check(st,x1)
if f:
    print("Yes")
else:
    print("No")