#include <stdio.h>
#include <stdlib.h>

main()
{
  double d;
  int c;

  srand48(time(0));

  while(1) {
    c = getchar();
    if (c == EOF) exit(0);
    if (c == '\n') {
      d = drand48();
      printf("%.7lf\n", d);
      fflush(stdout);
    }
  }
}