#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll pp(ll n) {
    ll tong=0;
    for (ll i=1;i*i<=n;++i) {
        if (n%i==0) {
            tong+=i;
            if (i!=1 &&  i*i!=n) {
                tong+=n / i;
            }
        }
    }
    return tong>n;
}
int main() {
    // freopen("SOPP.INP","r",stdin);
    // freopen("SOPP.OUT","w",stdout);
ll a,b,dem=0;
cin>>a>>b;
for(ll i=a;i<=b;++i)
{
    if(pp(i))
    {
        dem++;
    }
}
cout<<dem;
}