#include <stdio.h>

int n;
int arr[200000];
int been[200000];

int main(){
	while(scanf("%d", &n)>=0){
		for(int i=0;i<n;i++){
			scanf("%d", arr+i);
			arr[i]--;
			been[i] = 0;
		}
		int sum = 0;
		for(int i=0;i<n;i++){
			if (been[i]) continue;
			int pos = i;
			int c = -1;
			while (!been[pos]) {
				been[pos] = 1;
				c++;
				pos = arr[pos];
			}
			//printf("%d\n", c);
			sum += c;
		}
		printf("%d\n", sum);
	}
}