#include <bits/stdc++.h>

using namespace std;

#define fio ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);

typedef long long ll;
ll n,m;

ll solve(ll x){
    if(x==0LL)return 0LL;
    ll res=0LL,odmoc=int(sqrt(x));
    for(ll i=1;i<=odmoc;i++){
        res+=2LL*((x/i)-i)+1LL;
    }
    return res;
}

int main() { fio
    cin>>n>>m;
    //cout<<solve(n)<<endl;
    cout <<solve(m)-solve(n-1)<<endl;
    return 0;
}