#include <iostream>
#include <vector>

#define REP(i, a, b) for (int i = (a); i < (b); i++)
#define dump(s) cerr << __LINE__ << "\t:" << #s << " = " << (s) << endl \
    
using namespace std;

int main () {
    int N;
    cin >> N;
    vector<int> v(N);
    int sum = 0;
    REP (i, 0, N) {
	cin >> v[i];
	sum += v[i];
    }
    int cnt = 0;
    REP (i, 0, N) {
	if (sum >= v[i] * 10) {
	    cnt++;
	}
    }
    cout << cnt * 30 << endl;
    return 0;
}