#include <iostream>
#include <cmath>
using namespace std;
double fx(double x)
{
return pow(x,2)-cos(x);
}

int main()
{
float x = 0;
float y = 0;
  cout <<"x=";
  cin >> x;
  cout << "y=";
  cin >> y;

double R=(x+y)/2;
double f, esp=pow(-25.0,0);
while (fabs(x-y)>=esp)
{
f=(x+y)/2;
if(f<0) x=R;
if(f>0) y=R;
R=(x+y)/2;
cout<<"f("<<x<<")= "<<R<<endl;
}

 cout<<"x= "<<x<<endl;
 cout<<"y= "<<y<<endl;
 cout<<"realen koren= "<<R;

 return 0;
}