N = int(input())

D = {}
for i in range(N-1) :
    a,b = map(int,input().split())
    if a not in D :
        D[a] = 1
    else :
        D[a] += 1
    if b not in D :
        D[b] = 1
    else :
        D[b] += 1

ans = 0
for i in D.values() :
    if i >= 3 :
        ans += i - 2
print(ans)