def main():
    import sys
    input = sys.stdin.read().split()
    ptr = 0
    N = int(input[ptr])
    ptr += 1

    # Read red edges, but ignore them
    for _ in range(N-1):
        ptr += 2

    # Read black edges
    degrees = [0] * (N + 1)
    for _ in range(N-1):
        a = int(input[ptr])
        b = int(input[ptr+1])
        ptr += 2
        degrees[a] += 1
        degrees[b] += 1

    # Count the number of leaves in the black tree
    L = sum(1 for i in range(1, N+1) if degrees[i] == 1)

    # Compute the result
    result = (N - 1) + (L - 2)
    print(result)

if __name__ == "__main__":
    main()