import java.util.Scanner;

public class Main{
	public static void main(String args[]){
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			int n=sc.nextInt();
			int[] c=new int[n];
			double sum=0;
			for(int i=0;i<n;i++){
				c[i]=sc.nextInt();
				sum+=c[i];
			}
			sum/=10;
			int res=0;
			for(int i=0;i<n;i++){
				if(c[i]<=sum) res+=30;
			}
			System.out.println(res);
		}
	}
}