// Author: Volker Crede
// Date: 02/04/2008
// This program finds the largest positive float
// number x, such that (1.0 +x) - 1.0 == 0.

#include <iostream>
using namespace std;

int main() {
  float x = 1.0;
  float y = 2.0;

  while (y > 0) {
    x = x/2;
    y = (1.0 + x) - 1.0;
  }
  cout << x << endl;
}