#include <string>
#include <iostream>
#include <vector>


int main() {
	using namespace std;
	ios::sync_with_stdio(false);
	size_t n = 0;	
	while (cin >> n) {
		
		vector<size_t> v(n);
		for (size_t i = 0; i < n; ++i) {
			cin >> v[i];		
		}

		size_t c = 0;
		for (size_t i = 0; i < n; ++i) {
			while (i + 1 != v[i]) {
				swap(v[i], v[v[i] - 1]);
				++c;
			}
		}
		cout << c << endl;
	}
			
	return 0;
}