#include "bits/stdc++.h"
#include "atcoder/all"
#include "iomanip"
#include "algorithm"
#include "vector"
#include "math.h"
#include "bitset"
#include "random"
#include "set"
using namespace std;
using namespace atcoder;
#define rep(i, a, b) for(int i = a; i < (int)(b); i++)
#define rrep(i, a, b) for(int i = a; i >= (int)(b); i--)
#define vec vector
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define pub push_back
#define pob pop_back
#define prec setprecision
#define ll long long
#define ull unsigned long long
#define maxE *max_element
#define minE *min_element
#define p_queue priority_queue
using Graph = vec<vec<int>>;
using Pi = pair<ll,ll>;
const ll INF = 9E+18;

int main() {
	int L,R; cin >> L >> R;
	set<string> st;
	for(int i = L; i <= R; i++){
		if(1 <= i && i <= 295) st.insert("C++");
		else if(296 <= i && i <= 416) st.insert("Rust");
		else if(417 <= i && i <= 420) st.insert("Python");
	}
	cout << st.size()-1 << endl;
		
}