import java.util.Scanner;
public class Kyotaku {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        int sum=0,count=0;
        int[] c=new int[n];
        for(int i=0;i<n;i++){
            c[i]=sc.nextInt();
            sum+=c[i];
        }
        for(int i=0;i<n;i++)
            if(sum/10>=c[i])count++;
        System.out.println(count*30);
    }
}