#include<bits/stdc++.h>
using namespace std;
using Int = long long;
//INSERT ABOVE HERE
const Int MAX = 1e7+1000;
bool dp[MAX];
signed main(){
  Int n,l;
  cin>>n>>l;
  Int ans=0;
  memset(dp,0,sizeof(dp));
  for(Int i=2;i<MAX;i++){
    if(dp[i]) continue;
    for(Int j=i+i;j<MAX;j+=i) dp[j]=1;
    Int x=i*(n-1);
    ans+=max(0LL,l-x+1);
  }
  cout<<ans<<endl;
  return 0;
}