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

count = 0
for i in range(1,N+1):
    if len(G[i]) == 1:
        count += 1
print(count - 2)