/*
Example programs from the book Scientific and Engineering Programming
in C++: An Introduction with Advanced Techniques and Examples,
Addison-Wesley, 1994.
 
                 (c) COPYRIGHT INTERNATIONAL BUSINESS MACHINES
                 CORPORATION 1994.  ALL RIGHTS RESERVED.

See README file for further details.
*/
#include <stdio.h>
int main() {

  float x;
  /* ... */
  fscanf(stdin, "%f", &x);

  fprintf(stdout, "%f\n", x);
  return 0;
}