#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main(){
    int l,r;
    cin >> l >> r;

    vector<bool>check (3,false);
    for(int i=l;i<r+1;i++){
        if(i <= 295)check[0] = true;
        else if(i <= 416) check[1] = true;
        else check[2] = true; 
    }

    int ans = -1;
    for(auto x:check){
        if(x) ans++;
    }

    cout << ans << endl;

}