#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<math.h>
#include<algorithm>
#define N 100010

using namespace std;

int main()
{
    int t, y;
    double low, high, mid, k, x1, x2;
    scanf("%d", &t);
    while(t--)
    {
        scanf("%d", &y);
        low = 0;
        high = 100;
        x1 = 8 * pow(0, 4) + 7 * pow(0, 3) + 2 * pow(0, 2) + 3 * 0 + 6;
        x2 = 8 * pow(100, 4) + 7 * pow(100, 3) + 2 * pow(100, 2) + 3 * 100 + 6;
        if(x1 <= y && y <= x2)
        {
            while(high - low > 1e-7)/*注意1e-7*/
            {
                mid = (low + high) / 2;
                k = 8 * pow(mid, 4) + 7 * pow(mid, 3) + 2 * pow(mid, 2) + 3 * mid + 6;
                if(k > y)
                    high = mid - 1e-7;
                else if(k < y)
                    low = mid + 1e-7;
            }
            printf("%.4f\n", 1.0 * (low + high) / 2);
        }
        else
            printf("No solution!\n");

    }
    return 0;
}