#include<bits/stdc++.h>
int prime[10000000];
main(){
    for(int i = 2;i*i <=10000000;i++){
        if(prime[i])continue;
        for(int j = i*2;j < 10000000;j+=i)prime[j]=1;
    }
    int N,L;
    scanf("%d%d",&N,&L);
    long long sum = 0;
    for(int i = 2;i < 10000000;i++){
        if(prime[i])continue;
        if(i*(N-1)>L)break;
        sum += L-i*(N-1)+1;
    }
    printf("%lld\n",sum);
}