#include <cstdio>
#include <cstring>
#include <string>
#include <cmath>
#include <cassert>
#include <iostream>
#include <algorithm>
#include <stack>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <bitset>
using namespace std;

#define repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define rep(i,n) repl(i,0,n)
#define mp(a,b) make_pair(a,b)
#define pb(a) push_back(a)
#define all(x) (x).begin(),(x).end()
#define dbg(x) cout<<#x"="<<x<<endl
#define fi first
#define se second

#define INF 2147483600

#define LL 10000000
bool p[LL];
int primes[1000000];

int main(){
  int n,l;
  cin>>n>>l;

  int idx=0;
  fill(p, p+LL, true);
  p[0]=p[1]=false;
  for(int i=2;i<=l/2;i++) if(p[i]){
    primes[idx++]=i;
    for(int j=i*2; j<=l; j+=i)p[j]=false;
  }

  int reps=idx;
  idx=0;

  long res=0;
  while(idx<reps && (long)primes[idx]*(n-1) <= l){
    res += 1+l-(long)primes[idx]*(n-1);
    idx++;
  }

  cout<<res<<endl;

  return 0;
}