#include<bits/stdc++.h>
using namespace std;

long long a,b,c;

int main(){
	cin >> a >> b;
    int i=a;
    while(i <= b)
    {
        if(i % 6 == 0 || i % 8 == 0)i++;
        c+=i;
    }
    cout<<c;
    
	return 0;
}