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

long long a, b, c;

int main(){

ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
cin >> a >> b;
    int i=a;
    while(i <= b)
    {
        if(i % 6 == 0 || i % 8 == 0)i++;
        c += i;
    }//else能写什么啊，不写就TLE
    cout << c;

return 0;
}