#include <iostream>
#include <fstream>

using namespace std;

typedef unsigned char byte;
typedef signed char sbyte;

struct observation
{ short int year;
  byte      month, day;
  short int mint, avgt, maxt;
  sbyte     snow, rain;
  byte      wind; };

int main()
{ if (sizeof(observation) != 23)
  { cerr << "Look out! sizeof(observation) is " << sizeof(observation) << ", not 13\n";
    exit(1); }
  cout << "OK so far\n"; }