#include <iostream>

using namespace std;


int main() {
	long count;

	while (cin >> count) {
		long * pole = new long[count];
		long result = 0;

		for (long i = 0; i < count; i++) {
			cin >> pole[i];
		}

		for (long i = 0; i < count; i++) {
			while (pole[i] != i + 1) {
				long monster = pole[pole[i] - 1];
				pole[pole[i] - 1] = pole[i];
				pole[i] = monster;
				result++;
			}
		}

		delete pole;
		cout << result << endl;
	}
	



	return 0;
}