#include <iostream>
#include <cmath>

using namespace std;

/*
 * Exercise 1
 */

double f(unsigned int k, int x) {
	double sum = x;

	for (unsigned int i = 2; i <= k; i++) {
		if (i & 1) // if odd
			sum = 3 * sum + 1;
		else
			sum /= 2;
	}

	return sum;
}

void ex1() {
	int x;
	cin >> x;

	cout << f(35, x) << endl;
}

/*
 * Exercise 2
 */

void setMarmaladeType(int type, int *blueberryMarmalades, int *peachMarmalades, int *rosehipMarmalades) {
	if      (type %  7 == 0) *blueberryMarmalades += 1;
	else if (type % 13 == 0) *peachMarmalades += 1;
	else if (type % 17 == 0) *rosehipMarmalades += 1;
}

void ex2() {
	int archiveLength;
	cin >> archiveLength;

	int blueberryMarmalades = 0, peachMarmalades = 0, rosehipMarmalades = 0;

	for (int i = 0, digit, countryDigits, typeDigits, type; i < archiveLength; i++) {
		cin >> digit;
		cout << digit;

		if (i % 8 == 0) {
			countryDigits = 1;
			typeDigits = type = 0;
		}
		else if (countryDigits < 3) {
			countryDigits++;
		}
		else if (typeDigits < 4) {
			typeDigits++;
			(type *= 10) += digit;
		}
		else if (typeDigits == 4) {
			cout << endl;
			setMarmaladeType(type, &blueberryMarmalades, &peachMarmalades, &rosehipMarmalades);
		}
	}

	cout << "Мармалад от боровинки: " << blueberryMarmalades << endl;
	cout << "Мармалад от праскови: " << peachMarmalades << endl;
	cout << "Шипков мармалад: " << rosehipMarmalades << endl;
}

/*
 * Exercise 4
 */

bool isInteresting(int n) {
	int lastDigit;

	do {
		lastDigit = n % 10;
		n /= 10;

		if ((lastDigit & 1) == ((n % 10) & 1))
			return false;
	} while (n != 0);

	return true;
}

int sumOfInterestingNumsBetween(int a, int b) {
	int sum = 0;

	for (int i = a; i <= b; i++) {
		if (isInteresting(i))
			sum += i;
	}

	return sum;
}

void ex4() {
	int a, b;
	cin >> a >> b;

	cout << sumOfInterestingNumsBetween(a, b) << endl;
}

int main() {
	ex4();
}