#include <bits/stdc++.h>
using namespace std;

int main() {
	int n; cin >> n;
    vector <pair <int,int>> v(n);
    for(int i = 0; i < n; i++){
        int a;
        cin >> a;
        v[i] = {a,i};
    }
    int cnt = 0;
    sort(v.begin(),v.end());
    /*for(auto x : v){
        cout << x.second << ' ';
    }*/
    int maxi = v[0].second;
    int ans = 0;
    for(int i = 1; i < n; i++){
        maxi = max(maxi,v[i].second);
        ans = max(maxi - v[i].second, ans);
    }
    cout << ans;

}