// ,,廿_廿,,
#include<iostream>
#include<vector>
using namespace std;

int main(){
	int l,r;cin>>l>>r;
	int count=0;
	for(int i=l+1;i<=r;++i){
		if(i==296)count++;
		if(i==417)count++;
	}
	cout << count << endl;
}