#include <bits/stdc++.h>
using namespace std;
bool xtl(int x){
    while (x%2==0) x/=2;
    while (x%5==0) x/=5;
    return x==1;
}
int main(){
    int L, R;
    cin>>L>>R;
    int cnt=0;
    for (int i=L;i<=R;++i){
        if (xtl(i)) cnt++;
    }
    cout <<cnt<<endl;
     return 0;
}

都看到这里了，给个赞吧！🙏