#include <iostream>
#include <vector>
typedef long long ll;
using namespace std;
vector<int> sieve_of_eratosthenes(int n) { // enumerate primes in [2,n] with O(n log log n)
    vector<bool> is_prime(n+1, true);
    is_prime[0] = is_prime[1] = false;
    for (int i = 2; i*i <= n; ++i)
        if (is_prime[i])
            for (int k = i+i; k <= n; k += i)
                is_prime[k] = false;
    vector<int> primes;
    for (int i = 2; i <= n; ++i)
        if (is_prime[i])
            primes.push_back(i);
    return primes;
}
int main() {
    int n, l; cin >> n >> l;
    vector<int> primes = sieve_of_eratosthenes(l);
    ll ans = 0;
    for (int d : primes) {
        int k = l - d * (n-1) + 1;
        if (k < 0) break;
        ans += k;
    }
    cout << ans << endl;
    return 0;
}