N = int(input())
lsg = [[] for i in range(N)]
lsj = [0]*(N)
for i in range(N-1):
    a,b = map(int,input().split())
    a -= 1
    b -= 1
    lsg[a].append(b)
    lsg[b].append(a)
    lsj[a] += 1
    lsj[b] += 1

cnt = 0
for i in range(N):
    cnt += max(0,lsj[i]-2)
print(cnt)