n=int(input())
g=[[]for _ in range(n)]
for _ in range(n-1):
 u,v=map(int,input().split());u-=1;v-=1
 g[u]+=[v];g[v]+=[u]
p=[-1]*n
q=[0]
for u in q:
 for v in g[u]:
  if p[u]==v:continue
  p[v]=u;q+=[v]
dp=[(0,0)for _ in range(n)]
for u in q[::-1]:
 u0,u1=0,1
 for v in g[u]:
  if v==p[u]:continue
  v0,v1=dp[v]
  u0+=max(v0,v1)
  u1+=v0
 dp[u]=u0,u1
dp2=dp[:]
for u in q:
 u0,u1=dp2[u]
 for v in g[u]:
  if p[u]==v:continue
  v0,v1=dp[v]
  u0_v=u0-max(v0,v1)
  u1_v=u1-v0
  dp2[v]=(v0+max(u0_v,u1_v),v1+u0_v)
ans=n
for u in range(n):
 ans=min(ans,dp2[u][1])
print(ans)