from typing import List
def main():
    n = int(input().strip())
    abi = [list(map(int, input().strip().split())) for _ in range(n - 1)]
    deg = [0] * (n + 1)
    for ab in abi:
        deg[ab[0]] += 1
        deg[ab[1]] += 1
    ans = 0
    for i in range(1, n + 1):
        ans += max(0, deg[i] - 2)
    print(ans)
main()