from collections import defaultdict

def main():
    N = int(input())
    d = defaultdict(int)
    for _ in range(N-1):
        a, b = map(int, input().split())
        d[a] += 1
        d[b] += 1

    ans = 0
    for i in d.values():
        ans += max(i-2,0)

    print(ans)



if __name__ == "__main__":
    main()