" Life is not a problem to be solved but a reality to be experienced! "
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using namespace std;
int main()
{
int x;
cin>>x;
int y=0;
int licz=0;
while(x>0)
{
y=x%10;
x=x/10;
if(y%2!=0) licz++;
}
cout<<licz<<endl;
system("PAUSE");
return 0;
}