#include<iostream>
#include<vector>
#include<utility>
#include<algorithm>
#include<iterator>
using namespace std;

int main()
{
    int N;
    cin >> N;
    vector<pair<int,int>> A(N);
    for(vector<pair<int,int>>::size_type i=0; i<N; i++)
    {
        cin >> A[i].first;
        A[i].second = i;
    }
    vector<pair<int,int>> B(A);
    sort(B.begin(), B.end());
    int ret = 0;
    for(vector<pair<int,int>>::size_type i=0; i<N; i++)
    {
        if(A[max(B[i].second-1,0)].first != -1)
        {
           A[B[i].second].first = -1 ;
           ret++;
        }
    }
    cout << ret << endl;
    
    return 0;
}