#include<set>
using namespace std;
#include<iostream>
int	main(){

	int N, C, c[100], n;
	cin >> N;
	C = 0;
	n = 0;

	for (int i = 0; i <N; i++ ){
		cin >> c[i];
		C+= c[i];
	}

	for (int i = 0; i <N; i++ ){
		if (c[i] <= 0.1*C){
			n+= 30;
		}
	}
	cout << n << endl;
}