from collections import deque
n = int(input())
ab = [[] for i in range(n)]
for i in range(n-1):
    a,b = map(int,input().split())
    a -= 1
    b -= 1
    ab[a].append(b)
    ab[b].append(a)

d = deque()
chk = [0]*n
ans = 0

for i in range(n):
    if len(ab[i]) > 2:
        ans += len(ab[i]) - 2

print(ans)

"""
for i in range(n):
    if chk[i] == 0:
        d.appendleft(i)
        chk[i] = 1
        while len(d):
            tmp = d.popleft()
            if chk[tmp] == 0:
                if len(ab[tmp]) > 2:
                    ans += len(ab[tmp]) - 2
                    d.
"""