#include <iostream>
#include <fstream>
using namespace std;

long long nr_total_div(int n){
    unsigned long long nr = 0;
    long long a = 1;
    while((long long)a*a<=n){
        nr+=1+2*(n/a-a);
        a++;
    }
    return nr;
}
int main()
{
    ifstream fin("ndiv.in");
    ofstream fout ("ndiv.out");
    unsigned long long n,m;
    fin>>n>>m;
    fout<<nr_total_div(m)-nr_total_div(n-1);

    return 0;
}