from collections import defaultdict

N = int(input())
d = defaultdict(int)
for _ in range(N-1):
    a, b = [int(i) for i in input().split()]
    d[a] += 1
    d[b] += 1
ans = 0
val = list(d.values())
val.sort()
for i in val:
    if i == 1:
        ans += 1
    else:
        break
print(ans-2)