#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
ll n, m;
ll d(ll x)
{
if (x==0) return 0;
if (x==1) return 1;
ll k=1;
ll ans=0;
for (; k*k<=x; ++k)
{
ans+=2*(x/k);
ans-=2*(k-1);
--ans;
}
return ans;
ans*=2;
ans-=k-1;
//cerr<<k-1<<endl;
return ans;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin>>n>>m;
    //cerr<<d(m)<<" "<<d(n-1)<<endl;
    cout<<d(m)-d(n-1);
}