#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a[10]={1,0,1,0,0,0,1,0,2,1},ans=0,n;
	cin>>n;
    while(n){
        ans+=a[n%10];
        n/=10;
    }
    cout<<ans;
return 0;}