#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

#define x first
#define y second
#define ndl '\n'
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define up_b upper_bound
#define low_b lower_bound
#define sz(x) (int)x.size()
#define bit __builtin_popcount
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

using namespace std;
using namespace __gnu_pbds;

template<typename T> using indexed_set = tree <T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

typedef long long ll;
typedef long double ld;
typedef unsigned int uint;
typedef unsigned long long ull;
typedef pair<ll, ll> pll;
typedef pair<int, int> pii;
typedef pair<int, ll> pil;
typedef pair<ll, int> pli;
typedef pair<int, ull> piu;
typedef vector<vector<int>> matrix;

const ll INF = 1e18 + 123;
const ld EPS = 1e-9;
const int inf = 1e9 + 123;
const int MOD = 1e9 + 7;
const int N = 81;
const int M = 1e6 + 123;
const double pi = 3.14159265359;
const int dx[] = {0, 0, 1, -1};
const int dy[] = {1, -1, 0, 0};

ll dp[N][N];

void solve(){
    int n;
    cin >> n;
    memset(dp, -1, sizeof dp);
    dp[0][0] = 1000;
    for (int i = 1, x; i <= n; i++){
        cin >> x;
        for (int j = 0; j < N; j++){
            for (int k = 0; k < N; k++){
                if (dp[i-1][k] == -1) continue;
                dp[i][j] = max(dp[i][j], dp[i-1][k] - (j-k)*x);
            }
        }
    }
    cout << dp[n][0];
}

int main(){
    #ifdef KAZAKH
        freopen("input.txt", "r", stdin);
    #endif
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    //cin >> t;
    for (int i = 1; i <= t; i++){
        //cout << "case #" << i << ": ";
        solve();
    }
    return 0;
}
