#include <bits/stdc++.h>

using namespace std;

int main()
{
	vector<int> chambers;
	int n;
	while (cin >> n)
	{
		chambers.clear();
		chambers.resize( n + 2);
		for ( int i = 1; i <= n; ++i )
		{
			cin >> chambers[i];
		}
		int res = 0;
		for (int i=1;i<=n;++i){
			int tmp = chambers[i];
			while(tmp != i){
				int tmp2 = chambers[tmp];
				chambers[tmp] = tmp;
				tmp = tmp2;
				res++;
			}
		}
		cout << res << endl;
	}
}