#include<bits/stdc++.h>
using namespace std;
long long bins(long long a,long long c,long long akt)
{
    long long pom=akt/c+1;
    return pom;
}
long long solve(long long a)
{
    long long wynik=0;
    for(int x=1;x<=1e6;x++)
        wynik+=a/x;
    if(a<=1e6)
        return wynik;
    long long co=a/(1e6+1),where=1e6+1,pom;
    while(co!=0)
    {
        pom=bins(where,co,a);
        wynik+=((pom-where)*co);
        where=pom;
        co=a/where;
    }
    return wynik;
}
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    long long a,b;
    cin>>a>>b;
    cout<<solve(b)-solve(a-1);
    return 0;
}