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

int main() {
    int a, b;
    vector<int> f;
    int s[] = {2, 3, 5, 7};
    long long ans = 0LL;

    cin >> a >> b;

    for (int i=a; i<=b; i++){
        bool f = true;
        for(int j=0; j<4; j++){
            if (i / s[j] > 1 && i % s[j] == 0){
                f = false;
                break;
            }
        }

        if (f){
                ans += (long long) pow(i, 3) - pow(i, 2) + 1 + i;
        }
    }
    cout << ans << endl;
}