1 #include <iostream>
 2 #include <cmath>
 3 #include <iomanip>
 4 using namespace std;
 5 
 6 double cal(double x)
 7 {
 8     return 8*pow(x,4) + 7*pow(x,3) + 2*pow(x,2) + 3*x + 6;
 9 }
10 double GetAns(double y)
11 {
12     double a=0,b=100;
13     while(b-a>1e-6){
14         double mid=(a+b)/2;
15         cal(mid)<y?a=mid:b=mid;
16     }
17     return (a+b)/2;
18 }
19 int main()
20 {
21     int T;
22     cin>>T;
23     while(T--){
24         double y;
25         cin>>y;
26         if(cal(0)<=y && y<=cal(100)){
27             cout<<setiosflags(ios::fixed)<<setprecision(4);
28             cout<<GetAns(y)<<endl;
29         }
30         else
31             cout<<"No solution!"<<endl;
32     }
33     return 0;
34 }