import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class A {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            int N = Integer.parseInt(br.readLine());
            int[] C = new int[N];
            int sum = 0;
            String[] CString = br.readLine().split(" ");
            for (int i = 0; i < N; i++) {
                C[i] = Integer.parseInt(CString[i]);
                sum = sum + C[i];
            }

            int border = sum / 10;

            Arrays.sort(C);
            int count = 0;
            for (int i = 0; i < N; i++) {
                if (C[i] <= border) {
                    count++;
                } else {
                    break;
                }
            }
            System.out.println(count * 30);

        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }

}