#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <iomanip>
#include <cassert>
using namespace std;

#define GET_ARG(a,b,c,F,...) F
#define REP3(i,s,e) for (i = s; i <= e; i++)
#define REP2(i,n) REP3 (i,0,(int)(n)-1)
#define REP(...) GET_ARG (__VA_ARGS__,REP3,REP2) (__VA_ARGS__)
#define RREP3(i,s,e) for (i = s; i >= e; i--)
#define RREP2(i,n) RREP3 (i,(int)(n)-1,0)
#define RREP(...) GET_ARG (__VA_ARGS__,RREP3,RREP2) (__VA_ARGS__)
#define DEBUG(x) cerr << #x ": " << x << endl

typedef long long ll;

vector<int> get_primes(int n) {
    int i, j;
    vector<bool> prime(n+1);
    REP (i,2,n) prime[i] = true;
    for (i = 2; i * i <= n; i++) {
        if (prime[i]) {
            for (j = 2 * i; j <= n; j += i) {
                prime[j] = false;
            }
        }
    }
    vector<int> ret;
    REP (i,2,n) if (prime[i]) ret.push_back(i);
    return ret;
}

int main(void) {
    ll n, l;
    cin >> n >> l;
    vector<int> primes = get_primes(l);
    ll ans = 0;
    for (auto x: primes) if ((n-1) * x <= l) {
        ans += l - (n-1) * x + 1;
    }
    cout << ans << endl;
    return 0;
}