#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
 
double pierwiastek(double x, double eps) {
	double a = 0.0;
	double b = x;
	double c;
	while (fabs(b - a) > eps) {
		c = (a + b) / 2;
		if (c * c > x)
		b = c;
		else
		a = c;
	}
	return c;
}
int main() {
    cout << setprecision(2) << pierwiastek(2.0, 0.1)<< endl;
    cout << setprecision(3) << pierwiastek(2.0, 0.01)<< endl;
    cout << setprecision(5) << pierwiastek(2.0, 0.00001)<< endl;
    return 0;
}

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