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 i in range(N):
    ans += max(0, len(G[i]) - 2)
    
print(ans)