#include <iostream>
using namespace std;
bool este_echilibrat(int numar)
{
int suma_impare = 0, suma_pare = 0;
while(numar)
{
if(numar % 2 == 0)
suma_pare += numar % 10;
else
suma_impare += numar % 10;
numar /= 10;
}
return suma_impare == suma_pare;
}
int main()
{
int a, b, s = 0;
cin >> a >> b;
while(a <= b)
{
if(este_echilibrat(a))
{
s += a;
}
a++;
}
cout << s;
return 0;
}
