n = int(input())
degrees = [0] * (n + 1)  # 1-based

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

result = 0
for d in degrees[1:]:
    if d > 2:
        result += d - 2

print(result)