#include <iostream>
#include <vector>

using namespace std;

int main()
{
	int N;
	cin >> N;
	vector<int> cnt( N, 0 );

	for( int i = 0; i < N; i++ ) {
		int tmp;
		cin >> tmp;
		cnt[tmp]++;
	}
	int res = 0;
	for( int i = 0; i < N; i++ ) {
		if( cnt[i] == 1 ) {
			res++;
		}
	}
	cout << res << endl;
	return 0;
}