#include<stdio.h>
#include<stdlib.h>
#define x 100000

int main()
{
    long long int n , c=0,i;
    double ar[x] = {};

    while(scanf("%lld",&n)){
        if(n < 0) break;
        ar[c++] = n;
    }

    for(i=c-1; 0<=i; i--){
        printf("%.4lf\n",sqrt(ar[i]));
    }

    return 0;
}