import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
G = [[] for _ in range(N)]
deg = [0] * N
for _ in range(N - 1):
    a, b = map(int, input().split())
    a -= 1
    b -= 1
    G[a].append(b)
    G[b].append(a)
    deg[a] += 1
    deg[b] += 1

leaf = deg.count(1)
branch = deg.count(2)
if leaf + branch == N:
    print("Yes")
    exit()
if N - leaf - branch > 1:
    print("No")
    exit()

root = deg.index(max(deg))
dep = [-1] * N
q = [root]
dep[root] = 0
L = set()
while q:
    s = q.pop()
    if deg[s] == 1:
        L.add(dep[s])
        continue
    for t in G[s]:
        if dep[t] == -1:
            dep[t] = dep[s] + 1
            q.append(t)

if len(L) == 1:
    print("Yes")
else:
    print("No")