import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int[] voteobNum = new int[N];
		int voteTotal = 0;

		for(int i = 0; i < N; i++){
			voteobNum[i] = scan.nextInt();
			voteTotal += voteobNum[i];
		}

		int evaluationCriteria = voteTotal / 10;
		int depositTotal = 0;

		for(int i = 0; i < N; i++){
			if(voteobNum[i] <= evaluationCriteria) depositTotal += 30;
		}

		System.out.println(depositTotal);
		scan.close();
	}

}