n = int(input())
tree = [[] for i in range(n)]
for i in range(n-1):
    tmp1, tmp2 = map(int, input().split())
    tree[tmp1 - 1].append(tmp2 - 1)
    tree[tmp2 - 1].append(tmp1 - 1)
cnt = 0
for i in range(n):
    if len(tree[i]) == 1:
        cnt += 1
print(cnt - 2)