import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int n=sc.nextInt();
        int [] c =new int[n];
        int ans=0;
        int count=0;
        for ( int i=0; i<n; i++){
            c[i]=sc.nextInt();
            ans+=c[i];
        }

        ans=ans/10;

        for(int i=0; i<n; i++){
            if( ans >=c[i]){
                count++;
            }
        }
        System.out.println(30*count);
        sc.close();
	}
}