/**/
#include <iostream>
#include <cstdlib>
#include <cmath>

using namespace std;
 
int main(int argc, char *argv[])
{ int number, 
      N27=0, SUM27=0,count_all=0,
      sum_all=0, sum_even_by7=0; 
  double average;
  do {
  cout<<"Dose ena akeraio arithmo >0 (0 gia telos): ";
  cin>>number;
  } while (number <0);
  while (number !=0)
  {if (number%2==0 && number%7==0) 
       {SUM27=SUM27+number; N27++;}
   count_all++;
   sum_all=sum_all+number;
  do {
  cout<<"Dose ena akeraio arithmo >0 (0 gia telos): ";
  cin>>number;
  } while (number <0);
  }
  if (SUM27!=0)
     cout<<"To athroisma artiwn pou diarountai me 7 einai "<<SUM27<<endl;  
  else cout<<"Den yparxei artios pou diaireitai me 7"<<endl;          
  if (count_all!=0) {
     average= (double) sum_all/count_all;
     cout<<"To Plhthos dedomenvn einai "<<count_all<<endl;
     cout<<"MO dedomenwn einai "<<average<<endl;}
  else cout<<"Mhdeniko plhthos dedomenwn"<<endl;  
  
  system("Pause");
  return 0;
}