import java.util.Scanner;

/**
 * Created by chshru on 2017/11/4.
 */
public class B {

    public static void main(String[] args) {

        Scanner cin = new Scanner(System.in);
        int t = cin.nextInt();
        while (t-- > 0) {
            int m = cin.nextInt();
            int n = (1200 - 6 * m) / 7;
            if ((1200 - 6 * m) % 7 != 0)
                n++;
            System.out.print(n / 2);
            if (n % 2 != 0)
                System.out.print(".5");
            System.out.println();
        }
        cin.close();
    }
}