#include <stdio.h>
#include <iostream>
#include <string>
#include "rd.h"
using namespace std;

double read_double()
{
  double d;
  string s;

  while (1) {
    cin >> d;
    if (cin.eof()) exit(0);
    if (cin.fail()) {
      cin.clear();
      cin >> s;
    } else {
      return d;
    }
  }
}