#pragma GCC target("avx2")
#pragma GCC optimize("unroll-loops")

#include <algorithm>
#include <bitset>
#include <climits>
#include <cmath>
#include <cstring>
#include <deque>
#include <forward_list>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <regex>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

#define ALL(x) (x).begin(), (x).end()
#define PC(x) __builtin_popcount(x)
#define PCL(x) __builtin_popcountll(x)

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
template <class T>
bool chmax(T& a, const T& b)
{
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T>
bool chmin(T& a, const T& b)
{
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}
const double PI = 3.14159265358979323846;
const double PI2 = PI * 2.0;
const double EPS = 1E-09;
const ll MOD = 1E+09 + 7; // =998244353;
const ll INFL = 1E18;
const int INFI = 1E09;
const int MAX_N = 1E+07;
struct edge {
    int to, cost, id;
};

ll di[4] = { 0, -1, 0, 1 }, dj[4] = { 1, 0, -1, 0 };

ll N, L;
bool is_prime[MAX_N + 1];

ll sieve(ll n)
{
    ll p = 0;
    fill(is_prime, is_prime + n, true);
    is_prime[0] = is_prime[1] = false;
    for (ll i = 2; i <= n; i++) {
        if (is_prime[i]) {
            p++;
            for (ll j = i * i; j <= n; j += i) {
                is_prime[j] = false;
            }
        }
    }
    return p;
}

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> N >> L;

    sieve(L);

    ll ans = 0;
    for (ll d = 2; d <= L; ++d) {
        if (d * (N - 1) > L)
            break;
        if (is_prime[d])
            ans += (L - d * (N - 1) + 1);
    }

    cout << ans << "\n";

    return 0;
}