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

ans = 0
for e in E:
    ans += max(0, len(e)-2)
print(ans)