#include<iostream>
#include<cstdio>
using namespace std;
double f(double m){
    return 8 * m*m*m*m + 7 * m*m*m + 2 * m*m + 3 * m + 6;
}
int main()
{
    int t;
    double y;
    cin >> t;
    while (t--){
        cin >> y;
        if (y<f(0) || y>f(100)){ cout << "No solution!\n"; continue; }//没想起来怎么判断，唉
        double h = 0, e = 100, m;
        for (int i = 0; i < 100; i++){
            m = (h + e) / 2;
            if ( f(m)< y)h = m;
            else e = m;
        }
        printf("%.4lf\n", m);
    }
    return 0;
}