N = int(input())

V = [[] for i in range(N)]

for i in range(N - 1):
    
    a, b = map(int, input().split())
    
    V[a - 1] += [b - 1]
    
    V[b - 1] += [a - 1]
    
print(sum([max(len(v) - 2, 0) for v in V]))