import java.util.*;

public class Test {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
        int n = s.nextInt();
        int member[] = new int[n],sum = 0,count = 0,ave;

        for(int i=0;i<n;i++){
        	member[i] = s.nextInt();
        	sum += member[i];
        }

        ave = sum/10;

        for(int i=0;i<n;i++){
        	if(member[i] <= ave)
        		count++;
        }

        System.out.println((30*count));

    }
}