#includeusing namespace std; int main() { double x; cin>>x; double l=0,r=x; while(r-l>1e-8) { double mid=(l+r)/2; if (mid*mid>=x) r=mid; else l=mid; } printf("%1fn",l); return 0; }

#includeusing namespace std; int main() { double x; cin>>x; double l=0,r=x; while(r-l>1e-8) { double mid=(l+r)/2; if (mid*mid>=x) r=mid; else l=mid; } printf("%1fn",l); return 0; }