#include "iostream"

using namespace std;

int main()
{
int x;
cin>>x;
float y=(float)x, t1=x-0.001*x, t2=x+0.001*x;
if(x>0)
{
while((y*y)t2)
{
if((y*y)>t2)
y/=2;
else if((y*y) y+=(y/2);
}

}
cout<<"\nRoten="< cin.get();
cin.get();
return 0;
}