#include <bits/stdc++.h>
using namespace std;
bool spp(int n){
int u=0;
for(int i=1;i<=n/2;i++){
if(n%i==0){
u+=i;
}
}
if(u>n) return true;
else return false;
}
int main()
{
int a,b,d=0;
cin>>a>>b;
for(int i=a;i<=b;i++){
if(spp(i)) d+=1;
}
cout<<d;
return 0;
}
//bai3
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