#define _USE_MATH_DEFINES
#include  <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
#include<math.h>
#include<iomanip>
#include<stdio.h>
#include <stdlib.h>
#include<stdio.h>
#include <queue>
#include<map>
#include <fstream>
#include <sstream>
#include<set>
#include<stack>
#include<time.h>
#include <sys/types.h>
#include <tuple>
#include <numeric>
#include <iterator>

typedef long long int ll;
//#include<bits/stdc++.h>


using namespace std;





int main()
{

    int Q;
    Q = 1;
    //cin >> Q;


    while (Q--) {
        int n;
        cin >> n;
        int r = 0;
        vector<int>p(n);
        for (int i = 0; i < n; i++) {
            
            cin >> p[i];
            r += p[i];
        }
        sort(p.begin(), p.end());
        for (int i = 0; i < n; i++) {
            if (p[i] > r / 10) {
                cout << 30 * (i );
                return 0;
            }
        }
        cout << n * 30;
    }
    return 0;
}