# 次数2を超える数の和でいいのか

N = int(input())
deg = [0]*(N+1)

for i in range(N-1):
    a, b = map(int, input().split())
    deg[a] += 1
    deg[b] += 1
    
ans = 0
for i in range(1, N+1):
    calc = max(0, deg[i]-2)
    ans += calc
print(ans)