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

int main(){
    set<char> s;
    ll l,r; cin >> l >> r;
    for(ll i = l;i<=r;i++){
        if(1 <= i && i <= 295)s.insert('c');
        if(296<=i && i <= 416)s.insert('r');
        if(417<=i && i <= 420)s.insert('p');
    }
    cout << ll(s.size()) - 1 << endl;
}