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):
    if deg[i] > 2:
        ans += deg[i]-2
print(ans)