N=int(input())
f={}
for _ in range(N-1):
    a,b=map(int,input().split())
    f[a]=f.get(a,[])+[b]
    f[b]=f.get(b,[])+[a]
r=0
for v in f.values():
    l=len(v)
    if l>2:r+=l-2
print(r)