def main():
    import sys
    from collections import deque
    input = sys.stdin.readline

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

    ans = -2
    for v in range(1, N+1):
        ans += (len(adj[v]) == 1)
    print(ans)


if __name__ == '__main__':
    main()