#include <bits/stdc++.h>

using namespace std;

#define _GLIBCXX_DEBUG
#define dump(c) cerr << "> " << #c << " = " << (c) << endl
#define all(c) ((c).begin()), ((c).end())
#define rep(i, n) for(int i=0;i<(int)n;i++)
#define FOR(i, s, e) for(int (i)=(int)(s);(i)<(int)(e);++(i))
#define inf 0x3f3f3f3f
#define infl 0x3f3f3f3f3f3f3f3fLL

typedef long long ll;
typedef unsigned long long ull;


void print_vector(vector<int> v){rep(i,v.size()){if(i<(int)v.size()-1){cout<<v[i]<<" ";}else{cout<<v[i]<<endl;}}}


int main() {
    int N;
    cin >> N;
    vector<int> a(N);
    vector<int> b(N);
    vector<int> a_index(N+1);
    for (int i = 0; i < N; ++i) cin >> a[i];
    b = a;
    sort(all(b));

//    print_vector(a);
//    print_vector(b);
    int count = 0;
    while(a!=b){
        for (int i = 0; i < N; ++i) {
            a_index[a[i]] = i;
        }
        for (int i = N-1; i >= 0; --i) {
            if (a_index[i+1]<a_index[i]){
                a.insert(a.begin(), i);
                a.erase(a.begin()+a_index[i]+1);
                break;
            }
        }
        count++;
    }

    cout << count << endl;

    return 0;
}