import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

N = int(input())
deg = [0] * N
for _ in range(N-1):
    a, b = map(int, input().split())
    deg[a-1] += 1
    deg[b-1] += 1

ans = 0
for d in deg:
    ans += max(0, d-2)
print(ans)