#include <cstdlib>
#include <iostream>
#include <cmath>
 
using namespace std;
 
int main()
{
	double e;
	cin >> e;
	double a=1, l;
	do{
		l = sin(1/a) * a;
		a *= 2;
	  }while( abs(l-1)>e );
	  a /= 2;
	cout << "Проверка пройдена при x ==" << ( a == 1 ? " " : " 1/" ) << a << endl;
}