import sys

n=int(input())
if n == 1:
    print(0)
    sys.exit(0)
d=[0 for i in range(n + 1)]
for i in range(n-1):
    a,b=[int(j) for j in input().split()]
    d[a] += 1
    d[b] += 1

print(d.count(1) - 2)