# include <iostream>
# include <cmath>
using namespace std;
double f(double x, double y)
{
    double fx = 8 * pow(x, 4) + 7 * pow(x, 3) + 2 * pow(x, 2) + 3 * x + 6 - y;
    return fx;
}
int main()
{
    int t;
    cin >> t;
    while(t--)
    {
        double y;
        cin >> y;
        double begin = 0, end = 100, mid;
        int i = 0;
        while(1)
        {
            if(y < 6 || y > 8.0702e+8)
            {
                cout << "No solution!" << endl;
                break;
            }

            mid = (begin + end) / 2;
            if(fabs(f(mid, y)) <= 0.0001)
            {
                cout.precision(4);
                cout << fixed <<  mid << endl;
                break;
            }
            else if(f(mid, y) > 0)
            {
                end = mid;
            }
            else if(f(mid, y) < 0)
            {
                begin = mid;
            }
            //cout << mid << endl;
        }

    }


    return 0;
}