#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <typeinfo>
#include <fstream>
#include <climits>
#include <functional>

#define REP(i,n) for(int i = 0;i < n;i++)

using namespace std;
typedef long long ll;
const int INF = INT_MAX / 4;

const int max_n = 1e3;

vector<int> eratosthenes(int n) {
  bool arr[n];
  REP(i, n) arr[i] = 1;
  for(int i = 2;i < n;i++){
    if (arr[i]) {
      int c = i * 2;
      while (c < n) {
	arr[c] = 0;
	c += i;
      }
    }
  }

  vector<int> v;
  for(int i = 2;i < n;i++){
    if (arr[i]) {
      v.push_back(i);
    }
  }
  return v;
}


int main(void)
{
  cin.tie(0);
  ios::sync_with_stdio(false);

  int N, L;
  cin >> N >> L;

  vector<int> v = eratosthenes(L);

  ll cnt = 0;
  int d = 0;
  for(auto iter = v.begin();iter != v.end();iter++){
    d = L - *iter * (N-1) + 1;
    if (d > 0) cnt += d;
    else break;
  }

  cout << cnt << "\n";

  return 0;
}