#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define all(a) (a).begin(),(a).end()
#define pb emplace_back
#define INF (1e9+1)

int main(){
    int n;
    cin>>n;
    vector<int> v(n);
    rep(i,n)cin>>v[i];
    
    int base = *max_element(all(v));
    int p = max_element(all(v))-v.begin();
    
    int t = 1;
    for(int i=p-1;i>=0;i--){
        if(v[i]==base-1){
            t++;
            base--;
        }
    }
    
    cout<<n-t<<endl;
}