import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int n= koko.nextInt();
        int[] c = new int[n];
        int total=0;
        int count=0;
        for(int i=0; i<n; i++){
            c[i]=koko.nextInt();
            total = total +c[i];
        }
        for(int i=0; i<n; i++){
            if(c[i]<=total/10){
                count++;
            }
        }
        System.out.println(count*30);
    }
}