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