#include <string>
#include <iostream>

using namespace std;

int A[200005];

void doo(int n) {
	for (int i = 1; i <= n; ++i) {
		cin >> A[i];
	}
	
	/*for (int i = 1; i <= n; ++i) {
		cout << A[i];
	}*/
	
	int g = 0;
	
	for (int i = 1; i <= n; ++i) {
		while (A[i] != i) {
			int j = A[i];
			swap(A[i], A[j]);
			++g;
			//cout << "swap" << A[i] << "and" << A[j] << endl;
		}
		
		
		/*int  * min = &A[i];
		for (int j = i+1; j < n; ++j) {
			if (A[j] < *min) {
				min = &A[j];
			}	
		}
		if (*min != A[i]) {
			g++;
			int t = A[i];
			A[i] = *min;
			*min = t;
		}*/
	}
	cout << g << endl;
}

	
	
int main(){
	ios_base::sync_with_stdio(false);	
	
	int n;
	
	while (cin >> n) {
		doo(n);
	}
		
	return 0;
}