#include<iostream>

using namespace std;

double f(double x) {
   return (x - 3)*(x - 3) + 5;
}

int main() {

   double a = -100;
   double b = 100;
   
   double tol = 0.00001;
   
   while (b - a > tol) {
      double m1 = a + (b - a)/3;
      double m2 = a + (b - a)*2/3;
      
      if (f(m1) > f(m2)) a = m1;
      else b = m2; 
      cout << "min = " << (a + b)/2 << endl; 
   }
    
   return 0;
}