n = int(input())
g = [[] for _ in range(n)]
p = [False]*(n)
for _ in range(n-1):
    u, v = map(int, input().split())
    g[u-1].append(v-1)
    p[v-1] = True
s = [p.index(False)]
a = []
while s:
    i = s.pop()
    a.append(i)
    s.extend(g[i])
r = 0
b = [True]*n
for i in a[::-1]:
    x = sum(b[j] for j in g[i])
    if x == 0:
        continue
    r += x
    b[i] = False
print(r+1)