package yukicoder;

import java.util.Scanner;

public class Yuki191 {
	
	public static void main(String[] args ) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int c[] = new int[n];
		int total = 0;
		for (int i = 0; i < n; i++ ) {
			c[i] = scan.nextInt();
			total += c[i];
		}
		scan.close();
		int count = 0;
		for (int i = 0; i < n; i++ ) {
			if((total*0.1 >= c[i])) {
				count++;
			}
		}
		System.out.println(30*count);	
	}
}