#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-10;

int main() {
	vector<bool> a(10000001, true);
	a[0] = a[1] = false;
	for (int i = 2; i <= 10000000; i++)
		if (a[i])
			for (int j = i * 2; j <= 10000000; j += i)
				a[j] = false;
	int N, L; cin >> N >> L;
	ll ans = 0;
	for (int i = 1; i <= 10000000; i++) {
		if (!a[i]) continue;
		ll unko = (ll)(N - 1) * i;
		ans += max(0LL, L + 1 - unko);
	}
	cout << ans << endl;
}