#include <iostream>
#include <stdio.h>
#include <cstring>
#include <math.h>
#include <algorithm>
#include <vector>
#include <string>
#include <stdlib.h>
#include <queue>
#include <stack>
#include <utility>
#include <fstream>
#define rep(i,n) for(int i=0;i<n;i++)
#define rrep(i,n) for(int i=n-1;i>=0;i--)
#define FOR(i,a,b) for(int i=a;i<b;i++)
#define ll long long
#define INF 1000000001
#define mod 1000000007
#define p pair<int,int>
int dx[4]={0,1,0,-1};
int dy[4]={1,0,-1,0};
using namespace std;

int main(){
	
	int n,l;
	cin>>n>>l;
	int x=l/(n-1);
	vector<int> d(x+1);
	rep(i,x+1){
		d[i]=1;
	}
	for(int i=2;i*i<=x;i++){
		if(d[i]==1){
			FOR(j,i+1,x+1){
				if(j%i==0)d[j]=0;
			}
		}
	}
	/*FOR(i,2,x+1){
		if(d[i]==1){
			printf("%d\n",i);
		}
	}*/

	ll ans=0;
	FOR(i,2,x+1){
		ans+=(l-(n-1)*i+1)*d[i];
	}
	cout<<ans<<endl;

	return 0;
}