#include <iostream>
using namespace std;
 
const int MAX_SIZE  = 1000;
int main() {
	int n, v[MAX_SIZE + 1];
	cin >> n;
	int zone = 0;
	for (int i =1; i <= n; ++i) {
		cin >> v[i];
	}
	for (int i = 1; i <= n ; ++i) {
 		int flag = 1;
 			int destination = 1;
	for (int j = destination; j <= n; ++j ) {
		if(v[j] != i  ) {
		destination = v[j];
		} else {
				++zone;
			v[j] = 0;	
		}
		}
		if(flag == 1) {
			v[i] = 0;
		}
	}	
	cout << zone ;
	return 0;
}

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MTEKMTEgMSA3IDggMTAgMyA5IDIgNSA2IDQ=

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