#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repp(i, n) rep(i, 0, n)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define int long long
using namespace std;

int prime[10000010];
bool is_prime[10000010];

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

signed main(){
    int n, l, ans = 0, p;
    cin >> n >> l;
    p = sieve(10000000);
    rep(i, 0, p){
        ans += max((int)0, l - (n - 1) * prime[i] + 1);
    }
    cout << ans << endl;
}