#include<bits/stdc++.h> 
using namespace std; 
int a,b,sum;
int main()
{   
    cin>>a>>b;
    for(int d=1;d<=b;d++){
        sum+=b/d-(a-1)/d;
    }
    cout<<sum;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
int a,b,sum=0;
cin>>a>>b;
for (int i=a;i<=b;i++)
{
for (int j=1;j<=i;j++)
{
if (i%j==0)
sum++;
}
}
cout<<sum;
return 0;
}