#include <iostream>
#include <cmath>

using namespace std;
unsigned long long liczba_dzielnikow(unsigned long long x){
    unsigned long long pierw = sqrt(x);
    unsigned long long res = 2;
    if(x%2 != 0 ){
        for(unsigned long long i = 3; i<pierw; i+=2 ){
            if(x%i == 0){
                res+=2;
            }
        }
    }else{
        for(unsigned long long i = 2; i<pierw; i++ ){
            if(x%i == 0){
                res+=2;
            }
        }
    }
    if(x% pierw == 0 && pierw>1){
        if(pierw*pierw ==x){
            res++;
        }else{
            res+=2;
        }
    }
    return res;
}



int main() {
    ios_base::sync_with_stdio(false);
    unsigned long long n,m;
    cin>>n>>m;
    unsigned long long odp =0;
    for(unsigned long long i=n; i<=m; i++){
        odp += liczba_dzielnikow(i);
    }
    cout<<odp<<"\n";
    return 0;
}