R=range
J=lambda:list(map(int,input().split()))
N,*_=J()
A=[0]+J()
F=[0]*(N+1)
a=0
for i in R(1,N+1):
	S,j={},i
	while F[j]<1:F[j],S[j],j=1,1,A[j]
	if j in S:a+=1
print(a)