#include
     
      #include
      
       double f(double x){    return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6;}int main(void){    int t;    double y,x1,x2,x3,y1,y2,y3;    scanf("%d",&t);    while(t--)    {        scanf("%lf",&y);        x1=0;        x2=100;        y1=f(x1)-y;        y2=f(x2)-y;        if(y1>0||y2<0)        {            printf("No solution!\n");        }        else        {            while(fabs(y1-y2)>=0.0001)            {                x3=(x1+x2)/2;                y3=f(x3)-y;                if(y3>=0)                {                    x2=x3;                }                else                {                    x1=x3;                }                y1=f(x1)-y;                y2=f(x2)-y;            }            printf("%0.4f\n",x3);        }    }    return 0;}