N = int(input())
G = {i:[] for i in range(1,N+1)}
for _ in range(N-1):
    a,b = map(int,input().split())
    G[a].append(b)
    G[b].append(a)
cnt = 0
for i in range(1,N+1):
    a = len(G[i])
    if a>2:
        cnt += a-2
print(cnt)