class Member {
	int vote;
	static int sumVote;

	Member(int i) {
		this.vote = i;
	}
}

class City {
	static int money;
}

public class No_191 {

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);
		int n = sc.nextInt();
		Member[] member = new Member[n];

		for (int i = 0; i < n; i++) {
			member[i] = new Member(sc.nextInt());
			Member.sumVote += member[i].vote;
			City.money += 30;
		}

		for (Member m : member) {
			if (Member.sumVote / 10 < m.vote) {
				City.money -= 30;
			}
		}
		System.out.println(City.money);

	}

}