import java.util.Scanner;

public class yukicoder_191 {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		
		int n = stdIn.nextInt();
		int[] c = new int[n];
		
		int sosu = 0;
		
		for (int i = 0; i < n; i++) {
			c[i] = stdIn.nextInt();
			sosu += c[i];
		}
		
		int yuko = sosu / 10;
		int ninzu = 0;
		
		for (int i = 0; i < n; i++) {
			if (c[i] <= yuko) {
				ninzu++;
			}
		}
		
		System.out.println(ninzu * 30);
	}
}