import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Main {
	public static void main(String args[]) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String line = br.readLine();
		int n = Integer.parseInt(line);
		line = br.readLine();
		String[] lines = line.split(" ");
		int[] cs = new int[n];
		
		int total = 0;
		int i = 0;
		for (; i < n; i++) {
			cs[i] = Integer.parseInt(lines[i]);
			total += cs[i];
		}
		
		int border = total / 10;
		int res = 0;
		for (int t : cs) {
			if (t <= border) {
				res++;
			}
		}
		System.out.println(res * 30);
	}
}