from collections import defaultdict

N = int(input())
A = list(map(int, input().split()))
B = [0] * N
for i in range(N):
    B[A[i] - 1] = i + 1

d = defaultdict(int)
ans = []
for i in range(N):
    if not B[i] in d:
        ans.append(i + 1)
        d[B[i] - 1] += 1
print(len(ans))