#include <bits/stdc++.h>
#define pb push_back
#define REP(A,B) for(int (A)=0;(A)<(B);(A)++)
using namespace std;
int A[1111111];
int main()
{
	int n;
	while(scanf("%d", &n) == 1) {
		REP(i, n) {
			scanf("%d", A+i);
			A[i]--;
		}
		int ans = 0;
		REP(i, n) {
			if(A[i] != -1) {
				int j = i;
				int l = 0;
				while(A[j] != -1) {
					int t = A[j];
					A[j] = -1;
					l++;
					j = t;
				}
				ans += l-1;
			}
		}
		printf("%d\n", ans);
	}
	return 0;
}