#include <bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=long double;
using P=pair<ll,ll>;
using V=vector<ll>;
#define rep(i,n) for(ll i=0;i<n;i++)
#define REP(i,n) for(ll i=1;i<=n;i++)

int main(){
    int n;
    cin >> n;
    V a(n),b(n);
    rep(i,n){
        cin >> a[i];
        a[i]--;
        b[a[i]]=i;
    }

    int count=0;
    rep(i,n) if(a[i]!=i){
        int j=b[i];
        swap(a[i],a[j]);
        b[a[i]]=i;
        b[a[j]]=j;
        count++;
    }

    cout << 1-count%2*2 << endl;

}