#include<bits/stdc++.h>
#define lli long long int
using namespace std;
int main(){
lli l,r,i,j;
cin>>l>>r;
int count=0;
for(i=0;i<14;i++){
for(j=0;j<10;j++){
lli x=pow(3,i)*pow(5,j);
if(x>=l&&x<=r)
count++;
}
}
cout<<count<<endl;
}
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