#include<bits/stdc++.h>

using namespace std;
typedef unsigned int uint;
typedef long long int ll;
typedef unsigned long long int ull;

#define debugv(v) printf("L%d %s => ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;
#define debugm(m) printf("L%d %s is..\n",__LINE__,#m);for(auto v:m){for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debuga(m,w) printf("L%d %s is => ",__LINE__,#m);for(int x=0;x<(w);x++){cout<<(m)[x]<<" ";}cout<<endl;
#define debugaa(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[x][y]<<" ";}cout<<endl;}
#define ALL(v) (v).begin(),(v).end()
#define BIGINT 0x7FFFFFFF
#define E107 1000000007

template<typename T1,typename T2>
ostream& operator <<(ostream &o,const pair<T1,T2> p){o<<"("<<p.first<<":"<<p.second<<")";return o;}

int n,el;

bool nonprime[10000001];

void makeprime(int high){
    int i,j;
    nonprime[0]=true;
    nonprime[1]=true;
    for (i=2;i<=high;i++){
        if (!nonprime[i]){
            for (j=i*2;j<=high;j+=i){
                nonprime[j]=true;
            }
        }
    }
}
int main(){
    int i,j,k,l;
    ll d,result=0;
    
    cin>>n>>l;
    n--;
    makeprime(l);
    for (d=2;n*d<=l;d++){
        if (nonprime[d]) continue;
        result+=l-n*d+1;
    }

    cout<<result<<endl;

    return 0;
}