#include <stdio.h>
#include<math.h>

void main()
{
float a[1024];
  int i=0,count=0;

    do{
        scanf("%f",&a[i]);
        i++;
        count=i-1;
    }while((a[count]>=0)&&(a[count]<=pow(float(10),18)));
        getchar();

        for (i=count-1;i>=0;i--)
            printf("%.4f\n",sqrt((float)a[i]));

}