import java.util.*;
import java.lang.*;
import java.io.*;

// The main method must be in a class named "Main".
class Main {
    public static void main(String[] args) {
       Scanner s=new Scanner(System.in);
        String name=s.next();
        int count=0;
        for(int i=0;i<name.length();i++)
        {
            int ascii=(int)(name.charAt(i));
            if((i+1)%2!=0 || ascii%2!=0) count+=(i+1)*ascii;
        }
        System.out.print(count);
    }
}