#include <iostream>
using namespace std ;


int ifIsEvenNumber(int num);

void main()
{
    int num ;

    cout<<"hello please enter a number \n ";
    cin>>num ;

    ifIsEvenNumber(num);
    cout<<ifIsEvenNumber <<endl ;


}

int ifIsEvenNumber(int num)
{
    if(num==0)
        return 1 ;

    if ((num%10)%2 == 0)
        return ifIsEvenNumber(num/10)+1 ;
    else
        return ifIsEvenNumber(num/10);

}