#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int,int> P;
 
const int INF = 1e9;
const int mod = 1e9+7;
const double EPS = 1e-10;
const double PI = acos(-1.0);
 
int main()
{
    int n,sum = 0;
    cin >> n;
    vector<int> c(n);
    for(int i = 0; i < n; i++){
        cin >> c[i];
        sum += c[i];
    }
    int cnt = 0;
    for(int i = 0; i < n; i++){
        if(c[i]*10 <= sum) cnt++;
    }
    cout << cnt * 30 << endl;

    return 0;
}