N = int(input())
G = [[] for i in range(N)]
for _ in range(N - 1):
    a,b = map(int,input().split())
    G[a - 1].append(b - 1)
    G[b - 1].append(a - 1)
    
ans = 0
for v in range(N):
    if len(G[v]) >= 3:
       ans += len(G[v]) - 2
       
print(ans)