import java.util.Scanner;
public class No191 {
	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);
	}
}