/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static int sumOddDigits(long input) {
		int sum = 0;
		for (long temp = input; temp > 0; temp /= 100) {
        	sum += temp % 10;
    	} 
		return sum;
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		System.out.println(sumOddDigits(19293909090909090l));
	}
}

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