import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt(), sum = 0, ans = 0;
		int[] m = new int[n];
		for(int i = 0; i < n; i++){
			m[i] = sc.nextInt();
			sum += m[i];
		}
		for(int i = 0; i < n; i++){
			if(m[i]*10 <= sum){
				ans++;
			}
		}
		System.out.println(ans*30);
	}
}