#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef string str;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    ll n;
    cin >> n;
    vector<ll> a(n);
    ll sum = 0, countt = 0;
    for (ll i = 0; i < n; i++)
    {
        cin >> a[i];
        sum += a[i];
    }
    for (ll i = 0; i < n; i++) if (a[i] * 10 <= sum) countt++;
    cout << countt * 30 << "\n";
    return 0;
}