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

// Function to check if a number is prime
bool isPrime(int n) {
    if (n < 2) return false;
    for (int i = 2; i*i <= n; i++) {
        if (n % i == 0) return false;
    }
    return true;
}

// Function f(x) = x^3 - x^2 + x + 1
int f(int x) {
    return x*x*x - x*x + x + 1;
}

int main() {
    int A, B;
    cin >> A >> B;

    int sum = 0;
    for (int x = A; x <= B; x++) {
        if (isPrime(x)) {
            sum += f(x);
        }
    }

    cout << sum << "\n";  // End with a newline
    return 0;
}