#include<cstdio>
#include<iostream>
#include<algorithm>
#include<vector>
#include<queue>
#include<string>
#include<cstring>
#include<cmath>
#include<map>
#include<stack>
#define N 100005
#define ll long long
using namespace std;
vector<pair<int,int> >v;
int a[N],pos[N],vis[N];
int main()
{
	int n,i,j,ans;
	while(scanf("%d",&n)!=EOF)
	{
		ans = 0;
		for(i = 0;i<n;i++)
		{
			scanf("%d",&a[i]);
			pos[a[i]] = i;
		}
		for(i = 0;i<n;i++)
		{
			if(!vis[i]&&a[i]!=i)
			{
				vis[i] = 1;
				j = pos[i];
				while(j!=i)
				{
					vis[j] = 1;
					j = pos[j];
					ans++;
				}
				ans+=2;
			}
		}
		if(a[0]!=0)ans-=2;
		printf("%d\n",ans);
	}
    return 0;
}