import sys
from collections import defaultdict

def main():
    sys.setrecursionlimit(1 << 25)
    n = int(sys.stdin.readline())
    # Read red edges (not used in the solution)
    for _ in range(n-1):
        sys.stdin.readline()
    # Read black edges
    degree = defaultdict(int)
    for _ in range(n-1):
        c, d = map(int, sys.stdin.readline().split())
        degree[c] += 1
        degree[d] += 1
    res = n - 1
    for v in degree.values():
        if v >= 3:
            res += (v - 2)
    print(res)

if __name__ == "__main__":
    main()