#include<bits/stdc++.h>
#define ll long long int
using namespace std;

ll ile(ll akt,ll cel)
{
    ll maxi=akt/cel;
    ll mini=akt/(cel+1);
    //if(akt%(cel+1)==0)
    mini++;
    return max(0LL,(maxi-mini+1));
}

ll solve(ll akt)
{
    ll res=0;
    for(int i=1;i<=1e6;i++)
    {
        res+=akt/i;
    }
    ll wynik=akt/(1e6);
    ll idx=1e6+1;
    if(akt<=1e6) return res;
    while(akt/idx==wynik)
    {
        res+=wynik;
        idx++;
    }
    ll val=akt/idx;
    // TRZEBA POLICZYC 1....val
    for(ll i=1;i<=val;i++) res+=ile(akt,i);
    return res;
}

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    ll n,m; cin>>n>>m;
    cout<<solve(m)-solve(n-1);
    return 0;
}