1 #include<cstdio>
 2 #include<algorithm>
 3 #include<cmath>
 4 using namespace std;
 5 
 6 double cal(double x)
 7 {
 8     return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6;
 9 }
10 
11 int main()
12 {
13     double x,l,r;
14     int t;
15     scanf("%d",&t);
16     while(t--)
17     {
18         scanf("%lf",&x);
19         if(x<cal(0)||x>cal(100))
20         {
21             printf("No solution!\n");
22             continue;
23         }
24         l=0,r=100;
25         while(fabs(l-r)>1e-8)
26         {
27             double mid=(l+r)/2;
28             if(cal(mid)>x)
29             r=mid;
30             else
31             l=mid;
32         }
33         printf("%.4lf\n",l);
34     }
35     return 0;
36 }