#include <algorithm>
#include <numeric>
#include <string>
#include <vector>
#include <iostream>
#include <queue>
#include <utility>
#include <cmath>
#include <bitset>

using namespace std;


int main()
{
    int n;
    cin >> n;
    vector<int> a(n);

    for(auto&& x : a)
    {
        cin >> x;
    }

    auto max_itr = max_element(a.begin(),a.end());

    int count = 1;
    for(auto itr = max_itr - 1; itr != a.begin() -1; --itr)
    {
        if(*itr == *max_itr - count)
            ++count;
    }

    cout << n - count << endl;
}