#include <iostream>
#include <stdio.h>
#include <cmath>
using namespace std;

const double eps = 1e-12;
double x, y;

double calc(double x)
{
    return 8*x*x*x*x + 7*x*x*x + 2*x*x + 3*x + 6;
}

int main()
{
    int t;
    double mid, left, right;
    scanf("%d", &t);
    while(t--)
    {
        scanf("%lf", &y);
        left = 0; right = 100;
        if(calc(left) > y || calc(right) < y)
        {
            printf("No solution!\n");
            continue;
        }
        while(right - left > eps)   //二分查找
        {
            mid = (right+left)/2.0;
            if(calc(mid) > y) right = mid;
            else left = mid;
        }
        printf("%.4lf\n", mid);
    }

    return 0;
}