CSCHAN C++

#include <bits/stdc++.h>
using namespace std;
int x,n,d;
int main ()
{
    freopen("cschan.inp","r",stdin);
    freopen("cschan.out","w",stdout);
    //scanf("%d",&n);
    cin>>n;
    d=0;
    while(n>0)
    {
        x=n%10;
        if(x%2==0) d++;
        n=n/10;
    }
    //printf("%d",d);
    cout<<d;
}