import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    // dp[i]は和がi以上となるまでに振る回数の期待値
    double[] dp = new double[1000001];
    for(int i = 1; i < 1000001; i++) {
      double s = 0;
      for(int j = 1; j <= 6; j++) {
        if(i - j >= 0) s += (dp[i - j] + 1);
      }
      dp[i] = s / (double)6;
    }
    int T = sc.nextInt();
    for(int i = 0; i < T; i++) {
      System.out.println(dp[sc.nextInt()]);
    }
  }
}