N = int(input())
P = list(map(int,input().split()))

ans = 0
memo = [0] * N

for i in range(N):
	if memo[i] == 1:continue
	
	count = 0
	while True:
		memo[i] = 1
		i = P[i] - 1
		if memo[i] == 1:
			break
		else:
			count += 1
	ans += count
print(ans)