1 #include<iostream>
 2 #include<stdio.h>
 3 #define exp 1e-8
 4 using namespace std;
 5 
 6 double key;
 7 
 8 double Binary(double low,double high)
 9 {
10     while(high-low>exp)
11     {
12         double mid = (low+high)/2;
13         if(8*mid*mid*mid*mid + 7*mid*mid*mid + 2*mid*mid + 3*mid + 6 > key)
14             high=mid-exp;
15         else
16             low=mid+exp;
17     }
18     return low;
19 }
20 int main()
21 {
22     int t;
23     scanf("%d",&t);
24     while(t--)
25     {
26         scanf("%lf",&key);
27         if(6>key || 8*100*100*100*100 + 7*100*100*100 + 2*100*100 + 3*100 + 6 < key)
28             printf("No solution!\n");
29         else
30             printf("%.4f\n",Binary(0, 100));
31     }
32     return 0;
33 }