#include <iostream>

using namespace std;

int main()
{
setlocale (LC_ALL, "Russian");

    int chiselko = 0;
    int sum= 0;
    int count = 0;

    do

    {
  cin>> chiselko;
if (!cin)
{
cout<<("Не число");
return 1;
}

if (chiselko>0)
{

count ++;
sum= sum+chiselko;
}
    }
 while (chiselko!=0 );
 cout<< "Среднее арифмитическое чисел = "<< static_cast<double>(sum)/(count);
    return 0;
}