#include <iostream>
using namespace std;
bool echilibrat(int n)
{
    int s1=0,s2=0,cf;
    do
    {
        cf=n%10;
        n=n/10;
        if(cf%2==0)
            s1+=cf;
        else
            s2+=cf;
    }while(n);
    if(s1==s2)
        return 1;
    else
        return 0;
}
int main()
{
    int a,b,i;
    long long s=0;
    cin>>a>>b;
    for(i=a;i<=b;i++)
    {
        if(echilibrat(i)==1)
            s=s+i;
    }
    cout<<s;
    return 0;
}