#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)


vector<bool> primes;
void make_primes(int n)
{
	primes.resize(n + 1, true);
	primes[0] = primes[1] = false;
	rep(i, 2, sqrt(n))
	{
		if (primes[i])
		{
			for (int j = 0; i * (j + 2) < n; j++)
				primes[i * (j + 2)] = false;
		}
	}
}
//-----------------------------------------------------------------
typedef long long ll;
int N, L;
//-----------------------------------------------------------------
int main() {
	cin >> N >> L;
	make_primes(L);

	ll ans = 0;
	rep(i, 0, L) if(primes[i]) {
		int _max = i * (N - 1);
		if (L < _max) break;

		ans += L - _max + 1;
	}

	cout << ans << endl;
}