n = int(input())
g = [[] for i in range(n)]
ind = [0]*n
for i in range(n-1):
    a, b = map(int, input().split())
    a, b = a-1, b-1
    g[a].append(b)
    g[b].append(a)
    ind[a] += 1
    ind[b] += 1

ans = 0
for i in range(n):
    ans += max(0, ind[i]-2)
print(ans)