/**************************************
***************************************
*        Author:Tree                  *
*From :http://blog.csdn.net/lttree    *
* Title : Can you solve this equation?*
*Source: hdu 2119                     *
* Hint  : 二分搜索                    *
***************************************
**************************************/

#include <stdio.h>
#define EPS 1e-6
double jdz(double a)
{
    return a<0?-a:a;
}
double calcu( double x )
{
    return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6;
}
double binary_s( int y )
{
    double l,h,m;
    l=0,h=100;
    while( h-l>EPS )
    {
        m=(l+h)/2.0;
        if( calcu(m)>y )   h=m;
        else    l=m;
    }
    return (l+h)/2.0;
}
int main()
{
    int test,y;
    scanf("%d",&test);
    while(test--)
    {
        scanf("%d",&y);
        if( y<=6 || y>=calcu(100) )    printf("No solution!\n");
        else    printf("%.4lf\n",binary_s( y ) );
    }
    return 0;
}