package yukicoder;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) {
		BufferedReader read = new BufferedReader(new InputStreamReader(System.in));
		try {
			int N = Integer.parseInt(read.readLine());
			String[] box = read.readLine().split(" ");
			int[] v = new int[N];
			int total = 0;
			for (int i = 0; i < N; ++i) {
				v[i] = Integer.parseInt(box[i]);
				total += v[i];
			}

			int border = total / 10;
			int count = 0;
			for (int i = 0; i < N; ++i) {
				if (v[i] <= border) {
					++count;
				}
			}

			System.out.println(count * 30);

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}