#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for (int i = (a); i <= (b); i++)
#define FORD(i,a,b) for (int i = (a); i >= (b); i--)
#define REP(i,b) for (int i = 0; i < (b); i++)

const int N = 200000;

int a[N];
bool visited[N];

int main() {
    int n;
    while (scanf("%d", &n) == 1) {
        REP(i, n) {
            scanf("%d", &a[i]);
            a[i]--;
        }
        REP(i, n) visited[i] = false;
        int cycles = 0;
        REP(i, n) if (!visited[i]) {
            int x = i;
            while (!visited[x]) {
                visited[x] = true;
                x = a[x];
            }
            cycles++;
        }
        printf("%d\n", n - cycles);
    }
    return 0;
}