#include <stdio.h>
#include <set>

using namespace std;

int main()
{
	int N;

	while (scanf("%d", &N) != EOF)
	{
		int M[N + 1]; M[0] = 0;
		for (int i = 1; i <= N; i++)
		{
			int monster;
			scanf("%d", &monster);
			M[i] = monster;
		}

		set<int> X;
		for (int i = 0; i <= N; i++)
			X.insert(i);

		int ret = 0;
		while (!X.empty())
		{
			auto it = X.begin();
			int i = *it;
			//printf("YYY - %d\n", i);
			X.erase(it);
			i = M[i];

			while (X.count(i))
			{
				ret++;
				X.erase(i);
				//printf("XXX - %d\n", i);
				i = M[i];				
			}
		}

		printf("%d\n", ret);
	}

	return 0;
}