#include <iostream>
#include <string>
#include <vector>

using namespace std;

int main()
{
	int N;
	cin >> N;

	vector<int> C(N);
	int t = 0;
	for( int i = 0; i < N; i++ ) {
		cin >> C[i];
		t += C[i];
	}
	int c = 0;
	for( int i ; i < N; i++ ) {
		if( C[i] * 10 <= t ) {
			c++;
		}
	}
	cout << c*30 << endl;
	return 0;
}