#include<iostream>
#include<cmath>
#include<stdio.h>
using namespace std;
double A(double x)
{
    return (8*pow(x,4)+7*pow(x,3)+2*pow(x,2)+3*pow(x,1)+6);
}
int main()
{
    double  y;
    int T;
        cin>>T;
    while(T--)
    {
        cin>>y;
        if(A(0)>y||A(100)<y)
        {
            cout<<"No solution!"<<endl;
            continue;
        }
        else{
                double high,low,mid;
        high=100;
        low=0;
            while(low+1e-8<high)
            {
                mid=(high+low)/2;
                if(A(mid)>y)
                    high=mid;
                else
                    low=mid;
            }
          printf("%.4lf\n",low);
        }
    }
    return 0;
}