#include<bits/stdc++.h>
using namespace std;
#define rep(i, N) for(i = 0; i < N; i++)
#define ll long long

int main(void) {
    ll L,R;
    
    ll i, j, k;

    cin>>L>>R;

    set<string>s;
    for(i=L;i<=R;i++){
        if(i<=295)s.insert("C++");
        else if(i<=416)s.insert("Rust");
        else s.insert("Python");
    }

    cout<<s.size()-1<<endl;

    return 0;
}