from collections import defaultdict

N = int(input())
adj_dict = defaultdict(list)

for _ in range(N-1):
    a_i, b_i = map(int, input().split())
    adj_dict[a_i].append(b_i)
    adj_dict[b_i].append(a_i)

degree1 = 0

for i in range(1, N+1):
    if len(adj_dict[i]) == 1:
        degree1 += 1

print(degree1 - 2)