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

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