#include <bits/stdc++.h>
using namespace std;
ifstream in("mins.in");
ofstream out("mins.out");
typedef long long ll;
const ll lim=1e6+4;
bool ok[lim];
ll phi[lim];
ll ans=1;
ll c,d;
int main()
{
    in>>c>>d; --c,--d;
    if(c>d) swap(c,d);
    for(ll i=1;i<=d;++i)
        phi[i]=i;
    for(ll i=2;i<=d;++i)
    {
        if(!ok[i]) for(ll j=i;j<=d;j+=i)
            ok[j]=true,phi[j]=(phi[j]/i)*(i-1);
        if(i<=c) ans+=2*phi[i];
        else ans+=phi[i];
    }
    out<<ans<<'\n';
    return 0;
}