#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define all(obj) (obj).begin(), (obj).end()
using ll = long long;
using namespace std;

int main() {
    int L,R;cin>>L>>R;
    vector<bool> lang(3,false);
    for(int x = L; x <= R; x++){
        if( 1<=x && x <=295) lang[0]=true;
        else if( 296<=x && x<= 416) lang[1]=true;
        else lang[2]=true;
    }
    int ans = 0;
    for(int i = 0; i < 3; i++){
        if( lang[i] == true) ans++;
    }
    cout << ans-1<<endl;
}