n=int(input())
g=[[] for i in range(n+1)]

for i in range(n-1):
    a,b=map(int,input().split())
    g[a].append(b)
    g[b].append(a)
cnt=0
for i in range(1,n+1):
    if len(g[i]) == 1:
        cnt+=1

print(cnt-2)