n = int(input())
G = [[] for _ in range(n)]
for _ in range(n - 1):
    a,b = map(int,input().split())
    a -= 1
    b -= 1
    G[a].append(b)
    G[b].append(a)

ans = 0
for i in range(n):
    if len(G[i]) >= 3:
        ans += len(G[i]) - 2
print(ans)