import sys
input = sys.stdin.readline

N=int(input())
E=[[] for i in range(N)]
for i in range(N-1):
    x,y=map(int,input().split())
    x-=1
    y-=1
    E[x].append(y)
    E[y].append(x)

Q=[0]
B=[-1]*N
B[0]=0

while Q:
    x=Q.pop()

    for to in E[x]:
        if B[to]==-1:
            Q.append(to)
            B[to]=1-B[x]

print(min(B.count(0),B.count(1)))