node_num = int(input())

nodes_count = [0] * node_num

answer = 0
for i in range(node_num - 1):
    first, second = map(int, input().split())
    firstIndex = first - 1
    secondIndex = second - 1

    if nodes_count[firstIndex] == 2:
        answer += 1
    else:
        nodes_count[firstIndex] += 1

    if nodes_count[secondIndex] == 2:
        answer += 1
    else:
        nodes_count[secondIndex] += 1

print(answer)