N = int(input())
l = [[]for _ in range(N)]
for _ in range(N-1):
    a,b = [int(i)-1 for i in input().split()]
    l[a].append(b)
    l[b].append(a)
ans = 0
for lis in l:
    if len(lis) > 2:
        ans += len(lis)-2
print(ans)