#include <stdio.h>
#include <locale.h>


#define MAX_NUM 1000000000


int reverse(int num)
{
	int rem, sum = 0;

	while (num > 0) {
		rem = num % 10;
		sum = (sum * 10) + rem;
		num /= 10;
	}

	return sum;
}


int is_reversible(int num)
{
	int rev, rem, total;

	if (!(num % 10))
		return 0;

	rev = reverse(num);
	total = num + rev;

	while (total > 0) {
		rem = total % 10;
		if (!(rem % 2))
			return 0;

		total /= 10;
	}

	return 1;
}

int main(int argc, char** argv)
{
	int i, count = 0;

	for(i=1; i<MAX_NUM; i+=2)
		if (is_reversible(i))
			count++;

	setlocale(LC_NUMERIC, "");
	printf("There are %'d reversible numbers less than %'d\n", count*2, MAX_NUM);
	return 0;
}